Fix coloring bug in casting
Merge branch 'master' of https://github.com/armorik83/typescriptUnofficial.tmLanguage

# By okunokentaro
# Via armorik83 (1) and okunokentaro (1)
* 'master' of https://github.com/armorik83/typescriptUnofficial.tmLanguage:
  Support for type-casting