runtime(zip): revert unintended change to zip#Write()

This was wrongly included as of patch 1c67342
because apparently I messed up the use of git apply :/

Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/autoload/zip.vim

@@ -307,7 +307,6 @@ fun! zip#Write(fname)
   if has("unix")
    let zipfile = substitute(a:fname,'zipfile://\(.\{-}\)::[^\\].*$','\1','')
    let fname   = substitute(a:fname,'zipfile://.\{-}::\([^\\].*\)$','\1','')
-   let fname   = fnameescape(fname)
   else
    let zipfile = substitute(a:fname,'^.\{-}zipfile://\(.\{-}\)::[^\\].*$','\1','')
    let fname   = substitute(a:fname,'^.\{-}zipfile://.\{-}::\([^\\].*\)$','\1','')