Fix constructors redeclaration message

#KT-6966 Fixed

idea/testData/diagnosticMessage/constructorsRedeclarationTopLevel.kt

@@ -0,0 +1,7 @@
+// !DIAGNOSTICS_NUMBER: 2
+// !DIAGNOSTICS: CONFLICTING_OVERLOADS
+// !MESSAGE_TYPE: TEXT
+fun Element(x: String) {}
+class Element {
+    constructor(x : String) {}
+}