Uppercase the issue in open issue command in the JIRA plugin

plugins/jira/jira.plugin.zsh

@@ -67,7 +67,7 @@ function jira() {
       local issue_arg=$(git rev-parse --abbrev-ref HEAD)
       local issue="${jira_prefix}${issue_arg}"
     else
-      local issue_arg=$action
+      local issue_arg=${(U)action}
       local issue="${jira_prefix}${issue_arg}"
     fi
     local url_fragment=''