Big change in quickfix tests: no stupid test data format with "before" and "after" file prefixes

idea/testData/quickfix/insertDelegationCall/nonApplicableWithOneConstructor.kt

@@ -0,0 +1,9 @@
+// "Insert 'this()' call" "false"
+// ACTION: Insert 'super()' call
+// ERROR: Explicit 'this' or 'super' call is required. There is no constructor in superclass that can be called without arguments
+
+open class B(val x: Int)
+
+class A : B {
+    constructor(x: String)<caret>
+}