Shorten References: Compare resolved calls when shortening receiver of qualified call expression

#KT-13660 Fixed

idea/testData/shortenRefs/extensionFunctionVarInvokedWithQualifier.kt

@@ -0,0 +1,7 @@
+object X{ }
+
+<selection>class Y {
+    fun f(op: X.()->Unit) {
+        X.op()
+    }
+}</selection>

idea/testData/shortenRefs/extensionFunctionVarInvokedWithQualifier.kt.after

@@ -0,0 +1,7 @@
+object X{ }
+
+class Y {
+    fun f(op: X.()->Unit) {
+        X.op()
+    }
+}