Expand special search pattern on change id to 7-40

As gerrit uses 7 as sha length for most cases,
expanding this pattern to 7 to allow auto-redirect
to change detail page when only one match returned for that search query

Bug: Issue 12184
Change-Id: I307620f262af15082acf8642d9d67538c7f01d87
(cherry picked from commit ab655592d9dc08f7628a2f742503d67bb6b7a22a)

polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.js

diff --git a/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.js b/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.js
index be4c497..2ac5ee8 100644
--- a/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.js
+++ b/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.js
@@ -18,7 +18,7 @@
   'use strict';
 
   const LookupQueryPatterns = {
-    CHANGE_ID: /^\s*i?[0-9a-f]{8,40}\s*$/i,
+    CHANGE_ID: /^\s*i?[0-9a-f]{7,40}\s*$/i,
     CHANGE_NUM: /^\s*[1-9][0-9]*\s*$/g,
   };