Move to Companion Intention: Do not use qualified names as labels

#KT-11483 Fixed

idea/testData/intentions/moveToCompanion/doNotQualifyThisLabel.kt

@@ -0,0 +1,10 @@
+// WITH_RUNTIME
+package foo
+
+class InsertThis {
+    val v1 = 1
+    fun <caret>f() {
+        println(v1)
+    }
+    fun use() { f() }
+}

idea/testData/intentions/moveToCompanion/doNotQualifyThisLabel.kt.after

@@ -0,0 +1,15 @@
+// WITH_RUNTIME
+package foo
+
+class InsertThis {
+    val v1 = 1
+    fun use() {
+        Companion.f(this)
+    }
+
+    companion object {
+        fun f(insertThis: InsertThis) {
+            println(insertThis.v1)
+        }
+    }
+}