Add quick-fix for empty brackets after primary constructor

So #KT-18534 Fixed

compiler/testData/diagnostics/tests/modifiers/primaryConstructorMissingBrackets.kt

@@ -0,0 +1,2 @@
+class A private <!MISSING_CONSTRUCTOR_BRACKETS!>constructor<!><!SYNTAX!><!> {
+}

compiler/testData/diagnostics/tests/modifiers/primaryConstructorMissingBrackets.txt

@@ -0,0 +1,8 @@
+package
+
+public final class A {
+    private constructor A()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}