Fix fq-names of top-level extensions in intentions.

idea/testData/intentions/convertForEachToForLoop/simpleCharSequence.kt

@@ -0,0 +1,6 @@
+// WITH_RUNTIME
+fun foo() {
+    val x = "abcd"
+
+    x.forEach<caret> { it.equals('a') }
+}

idea/testData/intentions/convertForEachToForLoop/simpleCharSequence.kt.after

@@ -0,0 +1,8 @@
+// WITH_RUNTIME
+fun foo() {
+    val x = "abcd"
+
+    for (it in x) {
+        it.equals('a')
+    }
+}

idea/testData/intentions/convertForEachToForLoop/simpleSequence.kt

@@ -0,0 +1,6 @@
+// WITH_RUNTIME
+fun foo() {
+    val x = (1..4).asSequence()
+
+    x.forEach<caret> { it.equals(1) }
+}

idea/testData/intentions/convertForEachToForLoop/simpleSequence.kt.after

@@ -0,0 +1,8 @@
+// WITH_RUNTIME
+fun foo() {
+    val x = (1..4).asSequence()
+
+    for (it in x) {
+        it.equals(1)
+    }
+}