Create from usage: Do not generate function body if it's declared as a trait member

#KT-6078 Fixed

idea/testData/quickfix/createFromUsage/createFunction/call/beforeExtensionFunOnTrait.kt

@@ -0,0 +1,7 @@
+// "Create extension function 'foo'" "true"
+
+trait T
+
+fun test(t: T) {
+    val b: Boolean = t.<caret>foo("1", 2)
+}