Tokenizer/PHP: minor tweak
Tokenizer/PHP: minor tweak

Prevents some unnecessary token changes of the type `token 4 changed from T_STRING to T_STRING`.

jrfnl/PHP_CodeSniffer,jrfnl/PHP_CodeSniffer,jrfnl/PHP_CodeSniffer,stronk7/PHP_CodeSniffer,stronk7/PHP_CodeSniffer,squizlabs/PHP_CodeSniffer,stronk7/PHP_CodeSniffer,squizlabs/PHP_CodeSniffer,squizlabs/PHP_CodeSniffer