Explicit this inspection: fix false negative with local variable

#KT-30136 Fixed

idea/testData/inspectionsLocal/explicitThis/functionWithSameNameInvocableVariable.kt

@@ -0,0 +1,14 @@
+// PROBLEM: none
+class Some {
+    operator fun invoke() {}
+}
+
+class Other {
+    fun foo() {
+        val a = Some()
+        <caret>this.a()
+        a()
+    }
+
+    fun a() {}
+}

idea/testData/inspectionsLocal/explicitThis/functionWithSameNameVariable.kt

@@ -0,0 +1,9 @@
+class Foo {
+    fun foo() {
+        val a = 1
+        <caret>this.a()
+    }
+
+    fun a() {
+    }
+}

idea/testData/inspectionsLocal/explicitThis/functionWithSameNameVariable.kt.after

@@ -0,0 +1,9 @@
+class Foo {
+    fun foo() {
+        val a = 1
+        <caret>a()
+    }
+
+    fun a() {
+    }
+}

idea/testData/inspectionsLocal/explicitThis/variableWithSameNameFunction.kt

@@ -0,0 +1,9 @@
+class Foo {
+    fun foo() {
+        fun a() {
+        }
+        <caret>this.a
+    }
+
+    val a = 1
+}

idea/testData/inspectionsLocal/explicitThis/variableWithSameNameFunction.kt.after

@@ -0,0 +1,9 @@
+class Foo {
+    fun foo() {
+        fun a() {
+        }
+        <caret>a
+    }
+
+    val a = 1
+}