Fix wrong assumptions in quickfix

Diagnostic is always reported on overriden property

 #EA-64407 Fixed

idea/testData/quickfix/override/typeMismatchOnOverride/namedFunctionReturnOverrideInsideVariableInitializer.kt

@@ -0,0 +1,11 @@
+// "Change 'foo' function return type to 'Boolean'" "true"
+
+interface A {
+    fun foo(): Boolean
+}
+
+fun foo() {
+    val x = object : A {
+        override fun foo(): Boolean?<caret> = true
+    }
+}

idea/testData/quickfix/override/typeMismatchOnOverride/namedFunctionReturnOverrideInsideVariableInitializer.kt.after

@@ -0,0 +1,11 @@
+// "Change 'foo' function return type to 'Boolean'" "true"
+
+interface A {
+    fun foo(): Boolean
+}
+
+fun foo() {
+    val x = object : A {
+        override fun foo(): Boolean = true
+    }
+}