Override document title when upgrading

when using websockets, to mimic old behavior without them

tailbone/templates/upgrades/view.mako

@@ -66,7 +66,7 @@
               <div class="level-item has-text-centered"
                    style="display: flex; flex-direction: column;">
                 <p class="block">
-                  Upgrading (please wait) ...
+                  Upgrading ${app_title} (please wait) ...
                   {{ executeUpgradeComplete ? "DONE!" : "" }}
                 </p>
                 <b-progress size="is-large"
@@ -202,6 +202,7 @@
 
             ThisPage.methods.showExecuteDialog = function() {
                 this.upgradeExecuting = true
+                document.title = "Upgrading ${app_title} ..."
                 this.$nextTick(() => {
                     this.adjustTextoutHeight()
                 })