Append newline to EOF for .txt test data files

Reverts and fixes 102f0d3

compiler/testData/resolvedCalls/invoke/implicitReceiverForInvoke.txt

@@ -15,4 +15,4 @@ Resulting descriptor: fun Int.invoke(): Unit defined in Foo
 
 Explicit receiver kind = DISPATCH_RECEIVER
 Dispatch receiver = f {Foo}
-Extension receiver = IntExt{fun Int.<anonymous>(): Unit defined in bar}
+Extension receiver = IntExt{fun Int.<anonymous>(): Unit defined in bar}