fixup! fixup! fixup! Let's not make testing hard: use shiftwidth() wrapper

Author: blueyed

tests/_setup.vader

@@ -3,12 +3,12 @@ Execute (Setup):
   setglobal noexpandtab tabstop=8 softtabstop=0 shiftwidth=8
 
   if exists('*shiftwidth')
-    function! ShiftWidth()
+    function! Shiftwidth()
       return shiftwidth()
     endfunction
   else
     Log "WARNING: shiftwidth() not available!"
-    function! ShiftWidth()
+    function! Shiftwidth()
       return &shiftwidth
     endfunction
   endif