git: fix gtl alias argument

Fixes the error `no matches found` because the argument is not quoted.
See https://github.com/robbyrussell/oh-my-zsh/pull/7629#issuecomment-531151821

plugins/git/git.plugin.zsh

@@ -243,7 +243,7 @@ alias gswc='git switch -c'
 
 alias gts='git tag -s'
 alias gtv='git tag | sort -V'
-alias gtl='gtl(){ git tag --sort=-v:refname -n -l ${1}* }; noglob gtl'
+alias gtl='gtl(){ git tag --sort=-v:refname -n -l "${1}*" }; noglob gtl'
 
 alias gunignore='git update-index --no-assume-unchanged'
 alias gunwip='git log -n 1 | grep -q -c "\-\-wip\-\-" && git reset HEAD~1'