Psi2ir: fix parameter indices when generating extension invoke call

Incorrect `valueParameter` was passed to `generateValueArgument`, which
resulted in incorrect type being considered for generating suspend
conversion.

 #KT-50949 Fixed

native/native.tests/tests-gen/org/jetbrains/kotlin/konan/blackboxtest/NativeCodegenBoxTestGenerated.java

@@ -36646,6 +36646,12 @@ public class NativeCodegenBoxTestGenerated extends AbstractNativeCodegenBoxTest
                 runTest("compiler/testData/codegen/box/suspendConversion/chainedFunSuspendConversionForSimpleExpression.kt");
             }
 
+            @Test
+            @TestMetadata("kt50949_suspendConversionForExtensionFunction.kt")
+            public void testKt50949_suspendConversionForExtensionFunction() throws Exception {
+                runTest("compiler/testData/codegen/box/suspendConversion/kt50949_suspendConversionForExtensionFunction.kt");
+            }
+
             @Test
             @TestMetadata("overloadResolutionBySuspendModifier.kt")
             public void testOverloadResolutionBySuspendModifier() throws Exception {