tests: Trim .nim files trailing whitespace

via OSX: find . -name '*.nim' -exec sed -i '' -E 's/[[:space:]]+$//' {} +

tests/misc/tstrange.nim

@@ -4,23 +4,23 @@ discard """
 1
 2'''
 """
-# test for extremely strange bug
-
-proc ack(x: int, y: int): int =
-  if x != 0:
-    if y != 5:
-      return y
-    return x
-  return x+y
-
-proc gen[T](a: T) =
-  write(stdout, a)
-
-
-gen("hallo")
-write(stdout, ack(5, 4))
-#OUT hallo4
-
+# test for extremely strange bug
+
+proc ack(x: int, y: int): int =
+  if x != 0:
+    if y != 5:
+      return y
+    return x
+  return x+y
+
+proc gen[T](a: T) =
+  write(stdout, a)
+
+
+gen("hallo")
+write(stdout, ack(5, 4))
+#OUT hallo4
+
 # bug #1442
 let h=3
 for x in 0.. <h.int: