[FIR] Properly resolve implicit invoke calls

#KT-41990 Fixed

compiler/fir/analysis-tests/testData/resolve/kt41990.kt

@@ -0,0 +1,8 @@
+// ISSUE: KT-41990
+
+fun getLambda(): String.() -> Unit = null!!
+
+fun String.test_1(s: String) {
+    getLambda()()
+    getLambda()(s)
+}

compiler/fir/analysis-tests/testData/resolve/kt41990.txt

@@ -0,0 +1,8 @@
+FILE: kt41990.kt
+    public final fun getLambda(): R|kotlin/String.() -> kotlin/Unit| {
+        ^getLambda Null(null)!!
+    }
+    public final fun R|kotlin/String|.test_1(s: R|kotlin/String|): R|kotlin/Unit| {
+        R|/getLambda|().R|FakeOverride<kotlin/Function1.invoke: R|kotlin/Unit|>|(this@R|/test_1|)
+        R|/getLambda|().R|FakeOverride<kotlin/Function1.invoke: R|kotlin/Unit|>|(R|<local>/s|)
+    }