Shorten References: Skip companion receivers on callable references

This is temporary fix due to KT-13934 which prevents resolution
of references like X::foo where foo is a member or extension
of X companion object

idea/testData/shortenRefs/callableRefsOnCompanion.kt

@@ -0,0 +1,20 @@
+package test
+
+class A {
+    companion object {
+        fun foo() {
+
+        }
+    }
+}
+
+fun A.Companion.bar() {
+
+}
+
+fun test() {
+    <selection>A.Companion::foo
+    A.Companion::bar
+    (A.Companion)::foo
+    (A.Companion)::bar</selection>
+}

idea/testData/shortenRefs/callableRefsOnCompanion.kt.after

@@ -0,0 +1,20 @@
+package test
+
+class A {
+    companion object {
+        fun foo() {
+
+        }
+    }
+}
+
+fun A.Companion.bar() {
+
+}
+
+fun test() {
+    A.Companion::foo
+    A.Companion::bar
+    (A)::foo
+    (A)::bar
+}