Allow raw snippets without trailing slash
Allow raw snippets without trailing slash

Fixes an asymmetry where both of

  curl https://dpaste.de/xXxx
  curl https://dpaste.de/xXxx/

work, but

  curl https://dpaste.de/xXxx/raw/

fails without a trailing slash (because curl doesn't follow redirects by
default).

SanketDG/dpaste,bartTC/dpaste,SanketDG/dpaste,bartTC/dpaste,rbarrois/xelpaste,rbarrois/xelpaste,bartTC/dpaste,SanketDG/dpaste,rbarrois/xelpaste