used correct syntax for multiline results in tests

And also modified the runner to actually run them in JS.

tests/run/tfinally.nim

@@ -1,8 +1,8 @@
 discard """
   file: "tfinally.nim"
-  output: "came
+  output: '''came
 here
-3"
+3'''
 """
 # Test return in try statement:
 

tests/run/tfinally2.nim

@@ -1,9 +1,9 @@
 discard """
   file: "tfinally2.nim"
-  output: "A
+  output: '''A
 B
 C
-D"
+D'''
 """
 # Test break in try statement: