Don't print descriptors' toString() in diagnostic messages

Use DescriptorRenderer.TEXT instead, it doesn't print the debug information

idea/testData/diagnosticMessage/differentNamesForSameParameter.kt

@@ -0,0 +1,12 @@
+// !DIAGNOSTICS_NUMBER: 1
+// !DIAGNOSTICS: DIFFERENT_NAMES_FOR_THE_SAME_PARAMETER_IN_SUPERTYPES
+
+trait A {
+    fun foo(x: Int)
+}
+
+trait B {
+    fun foo(y: Int) {}
+}
+
+class differentNamesForSameParameter : A, B