Parameter info popup after completion insertion.

Do not add '(' if it's already exist in completion (+Tests).

idea/testData/completion/handlers/ExistingNoParamsFunction.kt

@@ -0,0 +1,10 @@
+package testing.handlers
+
+fun test() {
+}
+
+fun other() {
+    te<caret>()
+}
+
+// INSERT: test

idea/testData/completion/handlers/ExistingNoParamsFunction.kt.after

@@ -0,0 +1,10 @@
+package testing.handlers
+
+fun test() {
+}
+
+fun other() {
+    test()<caret>
+}
+
+// INSERT: test

idea/testData/completion/handlers/ExistingSingleBrackets.kt

@@ -0,0 +1,13 @@
+package Test.MyTest
+
+class A {
+    class object {
+        public fun testOther(a: Int) {
+
+        }
+    }
+}
+
+fun testMy() {
+    A.testOthe<caret>()
+}

idea/testData/completion/handlers/ExistingSingleBrackets.kt.after

@@ -0,0 +1,13 @@
+package Test.MyTest
+
+class A {
+    class object {
+        public fun testOther(a: Int) {
+
+        }
+    }
+}
+
+fun testMy() {
+    A.testOther(<caret>)
+}