Add quick-fix for empty brackets after primary constructor

So #KT-18534 Fixed

idea/testData/quickfix/implement/privateConstructor.kt

@@ -1,4 +1,4 @@
 // "class org.jetbrains.kotlin.idea.intentions.CreateKotlinSubClassIntention" "false"
 // ACTION: Create test
 
-abstract class <caret>Base private constructor
+abstract class <caret>Base private constructor()

idea/testData/quickfix/missingConstructorBrackets/basic.kt

@@ -0,0 +1,4 @@
+// "Add empty brackets after primary constructor" "true"
+
+class Fruit private constructor<caret> {
+}

idea/testData/quickfix/missingConstructorBrackets/basic.kt.after

@@ -0,0 +1,4 @@
+// "Add empty brackets after primary constructor" "true"
+
+class Fruit private constructor(<caret>) {
+}