Clarify path param naming (#32969)

In history (from some legacy frameworks), both `:name` and `name` are
supported as path path name, `:name` is an alias to `name`.

To make code consistent, now we should only use `name` but not `:name`.

Also added panic check in related functions to make sure the name won't
be abused in case some downstreams still use them.

routers/web/repo/issue_timetrack.go

@@ -60,7 +60,7 @@ func DeleteTime(c *context.Context) {
 		return
 	}
 
-	t, err := issues_model.GetTrackedTimeByID(c, c.PathParamInt64(":timeid"))
+	t, err := issues_model.GetTrackedTimeByID(c, c.PathParamInt64("timeid"))
 	if err != nil {
 		if db.IsErrNotExist(err) {
 			c.NotFound("time not found", err)