fixed wrong hidden char

I had a problem with the syntax file on terminal-vim (from MacVim, 7.4.183) in iTerm2 on OSX. Sometimes, when I opened a larger php-file I got the following error:

![screen shot 2014-02-23 at 00 08 38](https://f.cloud.github.com/assets/74780/2245835/46805c1e-9d5a-11e3-8eb6-bfcc2e37d257.png)

Forked it, cloned it and found it: on line 128 in php.vim right before `apc_register_serializer-0` was one hidden, non-printing char (that small `^@`): 

![screen shot 2014-02-24 at 14 42 41](https://f.cloud.github.com/assets/74780/2245870/de250ec0-9d5a-11e3-809c-f1fee262a58f.png)

Removed it and had no issues since. Funny thing - it does not even show in the diff. Meh :-/