Correct snipGlobal syntax regions (#1462)

The previous syntax group for snipGlobal was not matching and including the endglobal keyword, resulting in a wrong folding region.

This commit fixes this, to make the endglobal keyword matched and correctly included in the snipGlobal syntax region.

syntax/snippets.vim

@@ -133,16 +133,16 @@ syn cluster snipTabStopTokens add=snipTransformation
 
 " Generic (non-Python) {{{4
 
-syn region snipGlobal start="^global\_s" end="^\zeendglobal\s*$" contains=snipGlobalHeader nextgroup=snipGlobalFooter fold keepend
+syn region snipGlobal start="^global\_s" end="^endglobal\s*$" contains=snipGlobalHeader fold keepend
 syn match snipGlobalHeader "^.*$" nextgroup=snipGlobalBody,snipGlobalFooter skipnl contained contains=snipGlobalHeaderKeyword
-syn region snipGlobalBody start="\_." end="^\zeendglobal\s*$" contained contains=snipLeadingSpaces
+syn region snipGlobalBody start="\_." end="^\zeendglobal\s*$" contained nextgroup=snipGlobalFooter contains=snipLeadingSpaces
 
 " Python (!p) {{{4
 
-syn region snipGlobal start=,^global\s\+!p\%(\s\+"[^"]*\%("\s\+[^"[:space:]]\+\|"\)\=\)\=\s*$, end=,^\zeendglobal\s*$, contains=snipGlobalPHeader nextgroup=snipGlobalFooter fold keepend
+syn region snipGlobal start=,^global\s\+!p\%(\s\+"[^"]*\%("\s\+[^"[:space:]]\+\|"\)\=\)\=\s*$, end=,^endglobal\s*$, contains=snipGlobalPHeader fold keepend
 syn match snipGlobalPHeader "^.*$" nextgroup=snipGlobalPBody,snipGlobalFooter skipnl contained contains=snipGlobalHeaderKeyword
 syn match snipGlobalHeaderKeyword "^global" contained nextgroup=snipSnippetTrigger skipwhite
-syn region snipGlobalPBody start="\_." end="^\zeendglobal\s*$" contained contains=@Python
+syn region snipGlobalPBody start="\_." end="^\zeendglobal\s*$" contained nextgroup=snipGlobalFooter contains=@Python
 
 " Common {{{4