Psi2ir: fix function type check for fun interface conversion

Parameter of a synthetic SAM adapter always has a function type (not a
subtype). Checking for the subtypes broke the case from KT-46908, where
fun interface is itself a subtype of a function type.

 #KT-46908 Fixed

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/es6/semantics/IrJsCodegenBoxES6TestGenerated.java

@@ -11905,6 +11905,11 @@ public class IrJsCodegenBoxES6TestGenerated extends AbstractIrJsCodegenBoxES6Tes
             runTest("compiler/testData/codegen/box/funInterface/kt46512_indyFunInterfaceOverCallableReference.kt");
         }
 
+        @TestMetadata("kt46908_functionSupertype.kt")
+        public void testKt46908_functionSupertype() throws Exception {
+            runTest("compiler/testData/codegen/box/funInterface/kt46908_functionSupertype.kt");
+        }
+
         @TestMetadata("multimodule.kt")
         public void testMultimodule() throws Exception {
             runTest("compiler/testData/codegen/box/funInterface/multimodule.kt");

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/semantics/IrJsCodegenBoxTestGenerated.java

@@ -11311,6 +11311,11 @@ public class IrJsCodegenBoxTestGenerated extends AbstractIrJsCodegenBoxTest {
             runTest("compiler/testData/codegen/box/funInterface/kt46512_indyFunInterfaceOverCallableReference.kt");
         }
 
+        @TestMetadata("kt46908_functionSupertype.kt")
+        public void testKt46908_functionSupertype() throws Exception {
+            runTest("compiler/testData/codegen/box/funInterface/kt46908_functionSupertype.kt");
+        }
+
         @TestMetadata("multimodule.kt")
         public void testMultimodule() throws Exception {
             runTest("compiler/testData/codegen/box/funInterface/multimodule.kt");

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/semantics/JsCodegenBoxTestGenerated.java

@@ -11276,6 +11276,11 @@ public class JsCodegenBoxTestGenerated extends AbstractJsCodegenBoxTest {
             runTest("compiler/testData/codegen/box/funInterface/kt46512_indyFunInterfaceOverCallableReference.kt");
         }
 
+        @TestMetadata("kt46908_functionSupertype.kt")
+        public void testKt46908_functionSupertype() throws Exception {
+            runTest("compiler/testData/codegen/box/funInterface/kt46908_functionSupertype.kt");
+        }
+
         @TestMetadata("multimodule.kt")
         public void testMultimodule() throws Exception {
             runTest("compiler/testData/codegen/box/funInterface/multimodule.kt");

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/wasm/semantics/IrCodegenBoxWasmTestGenerated.java

@@ -6640,6 +6640,11 @@ public class IrCodegenBoxWasmTestGenerated extends AbstractIrCodegenBoxWasmTest
             runTest("compiler/testData/codegen/box/funInterface/kt46512_indyFunInterfaceOverCallableReference.kt");
         }
 
+        @TestMetadata("kt46908_functionSupertype.kt")
+        public void testKt46908_functionSupertype() throws Exception {
+            runTest("compiler/testData/codegen/box/funInterface/kt46908_functionSupertype.kt");
+        }
+
         @TestMetadata("compiler/testData/codegen/box/funInterface/equality")
         @TestDataPath("$PROJECT_ROOT")
         @RunWith(JUnit3RunnerWithInners.class)