Fix invalid error message on deleting mail from read only folder (#1488694)

CHANGELOG

@@ -1,6 +1,7 @@
 CHANGELOG Roundcube Webmail
 ===========================
 
+- Fix invalid error message on deleting mail from read only folder (#1488694)
 - Fix error where session wasn't updated after folder rename/delete (#1488692)
 - Replace data URIs of images (pasted in HTML editor) with inline attachments (#1488502)
 - Fix PLAIN authentication for some IMAP servers (#1488674)

program/include/rcmail.php

@@ -1774,10 +1774,7 @@ class rcmail extends rcube
         $err_code = $this->storage->get_error_code();
         $res_code = $this->storage->get_response_code();
 
-        if ($err_code < 0) {
-            $this->output->show_message('storageerror', 'error');
-        }
-        else if ($res_code == rcube_storage::NOPERM) {
+        if ($res_code == rcube_storage::NOPERM) {
             $this->output->show_message('errornoperm', 'error');
         }
         else if ($res_code == rcube_storage::READONLY) {
@@ -1792,6 +1789,9 @@ class rcmail extends rcube
                 $this->output->show_message('servererrormsg', 'error', array('msg' => $err_str));
             }
         }
+        else if ($err_code < 0) {
+            $this->output->show_message('storageerror', 'error');
+        }
         else if ($fallback) {
             $this->output->show_message($fallback, 'error', $fallback_args);
         }