KT-9450 «Replace overloaded operator with function call» breaks code for index access result saved to variable

#KT-9450 Fixed

idea/testData/intentions/operatorToFunction/inRightSideOfAssignment.kt

@@ -0,0 +1,4 @@
+fun foo(map: Map<String, String>) {
+    val a: String?
+    a = map<caret>[""]
+}

idea/testData/intentions/operatorToFunction/inRightSideOfAssignment.kt.after

@@ -0,0 +1,4 @@
+fun foo(map: Map<String, String>) {
+    val a: String?
+    a = map.get("")
+}