tests: Trim .nim files trailing whitespace

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

tests/manyloc/keineschweine/server/old_server_utils.nim

@@ -1,4 +1,4 @@
-import 
+import
   streams, md5, sockets, unsigned,
   sg_packets, zlib_helpers, idgen
 type
@@ -54,7 +54,7 @@ proc newClient*(addy: TupAddress): PClient =
   new(result, free)
   result.addy = addy
   result.outputBuf = newStringStream("")
-  result.outputBuf.flushImpl = proc(stream: PStream) = 
+  result.outputBuf.flushImpl = proc(stream: PStream) =
     stream.setPosition 0
     PStringStream(stream).data.setLen 0