Fix scripts/vim-patch.sh for Bash 4.3

Ref: https://github.com/neovim/neovim/pull/11514#issuecomment-568780231

scripts/vim-patch.sh

@@ -399,9 +399,11 @@ declare -A tokens
   list_vimpatch_tokens | while read -r vimpatch_token; do
     echo "$vimpatch_token" | grep '8\.0\.' | sed 's/.*vim-patch:8\.0\.\([0-9a-z]\+\).*/\1/'
   done
+}
 
 declare -A tokens
 declare -A vim_commit_tags
+
 _set_tokens_and_tags() {
   set +u  # Avoid "unbound variable" with bash < 4.4 below.
   if [[ -n "${tokens[*]}" ]]; then