Completion: fix shortening of fully qualified name for case of conflicts between property and function

#KT-31902 Fixed
#KT-33937 Fixed

idea/idea-completion/testData/handlers/multifile/PropertyFunctionConflict2-1.kt

@@ -0,0 +1,7 @@
+package a
+
+class Goo {
+    fun x() {
+        foo<caret>
+    }
+}

idea/idea-completion/testData/handlers/multifile/PropertyFunctionConflict2-2.kt

@@ -0,0 +1,5 @@
+package a.b
+
+val Foo.foo: Int get() = 123
+fun foo(i: (Int, Int) -> Unit) {}
+class Foo {}

idea/idea-completion/testData/handlers/multifile/PropertyFunctionConflict2.kt.after

@@ -0,0 +1,9 @@
+package a
+
+import a.b.foo
+
+class Goo {
+    fun x() {
+        foo { i, i2 ->  }
+    }
+}