Only redirect back to dapp if current tab is active

The "redirect back to dapp" behaviour can be disruptive when the
permissions connect tab is not active. The purpose of the redirect was
to maintain context between the dapp and the permissions request, but
if the user has already moved to another tab, that no longer applies.

ui/app/pages/permissions-connect/permissions-connect.component.js

@@ -110,11 +110,13 @@ export default class PermissionConnect extends Component {
 
     if (getEnvironmentType(window.location.href) === ENVIRONMENT_TYPE_FULLSCREEN) {
       setTimeout(async () => {
-        const { id: currentTabId } = await global.platform.currentTab()
+        const currentTab = await global.platform.currentTab()
         try {
-          await global.platform.switchToTab(requestAccountTabs[originName])
+          if (currentTab.active) {
+            await global.platform.switchToTab(requestAccountTabs[originName])
+          }
         } finally {
-          global.platform.closeTab(currentTabId)
+          global.platform.closeTab(currentTab.id)
         }
       }, 2000)
     } else if (getEnvironmentType(window.location.href) === ENVIRONMENT_TYPE_NOTIFICATION) {