IDE: Don't add this!! in AddExclExclCallFix for nullable member

access in extension function.

^KTIJ-10052 Fixed

idea/testData/quickfix/addExclExclCall/iterableInExtension.kt

@@ -0,0 +1,11 @@
+// "Add non-null asserted (!!) call" "true"
+// WITH_RUNTIME
+
+class C {
+    val list: List<String>? = null
+}
+
+// Test for KTIJ-10052
+fun C.test() {
+    for (s in <caret>list) {}
+}