KT-1231 Don't insert () after completion function in imports

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

@@ -0,0 +1,3 @@
+package testing
+
+import testing.some.someF<caret>

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

@@ -0,0 +1,4 @@
+package testing.some
+
+fun someFun() {
+}

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

@@ -0,0 +1,3 @@
+package testing
+
+import testing.some.someFun