Don't add import after insertion function with fqn

idea/testData/completion/handlers/multifile/TopLevelFunctionInQualifiedExpr-1.kt

@@ -0,0 +1,7 @@
+package some
+
+import jettesting.*
+
+fun other() {
+    data.topLevelFu<caret>
+}

idea/testData/completion/handlers/multifile/TopLevelFunctionInQualifiedExpr-2.kt

@@ -0,0 +1,4 @@
+package jettesting.data
+
+fun topLevelFunction() {
+}

idea/testData/completion/handlers/multifile/TopLevelFunctionInQualifiedExpr.kt.after

@@ -0,0 +1,7 @@
+package some
+
+import jettesting.*
+
+fun other() {
+    data.topLevelFunction()
+}