Add a back button to the Firefox Sync dialog

debian/patches/pureos/firefox-sync-dialog-Use-GtkHeaderBar.patch

+From: Alexander Mikhaylenko <alexander.mikhaylenko@puri.sm>
+Date: Mon, 26 Jul 2021 16:17:01 +0500
+Subject: firefox-sync-dialog: Use GtkHeaderBar
+
+Make sure there's a back button on mobile.
+---
+ src/resources/gtk/firefox-sync-dialog.ui | 13 +++++++++----
+ 1 file changed, 9 insertions(+), 4 deletions(-)
+
+diff --git a/src/resources/gtk/firefox-sync-dialog.ui b/src/resources/gtk/firefox-sync-dialog.ui
+index 8f6dfbe..6a12171 100644
+--- a/src/resources/gtk/firefox-sync-dialog.ui
++++ b/src/resources/gtk/firefox-sync-dialog.ui
+@@ -14,11 +14,16 @@
+         <property name="visible">True</property>
+         <property name="orientation">vertical</property>
+         <child>
+-          <object class="HdyHeaderBar">
++          <object class="HdyWindowHandle">
+             <property name="visible">True</property>
+-            <property name="decoration-layout">:close</property>
+-            <property name="show-close-button">True</property>
+-            <property name="title" translatable="yes">Firefox Sync</property>
++            <child>
++              <object class="GtkHeaderBar">
++                <property name="visible">True</property>
++                <property name="decoration-layout">:close</property>
++                <property name="show-close-button">True</property>
++                <property name="title" translatable="yes">Firefox Sync</property>
++              </object>
++            </child>
+           </object>
+         </child>
+         <child>

debian/patches/series

@@ -3,3 +3,4 @@
 pureos/tests-Disable-create_delete_dir-test.patch
 pureos/header-bar-Hide-keyboard-shortcuts-button-on-mobile.patch
 pureos/Disable-fullscreen.patch
+pureos/firefox-sync-dialog-Use-GtkHeaderBar.patch