Safe Delete: Move test classes and test data to refactoring directory

idea/testData/refactoring/safeDelete/deleteValueParameter/kotlinValueParameter/defaultParam2.kt

@@ -0,0 +1,7 @@
+fun foo(a: Int, b: Int = 0, <caret>c: Int = 0) {
+
+}
+
+fun bar() {
+    foo(1)
+}