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

idea/testData/quickfix/when/elseNotLastInWhen.kt

@@ -0,0 +1,9 @@
+// "Move else branch to the end" "true"
+fun test() {
+    val a = 12
+    when (a) {
+        1 -> { /* some code */ }
+        el<caret>se -> { /* other code */ }
+        2 -> { /* some more code */ }
+    }
+}