Bug 1577029 - Remove bogus max-height from Firefox Account menu header. r=Gijs

Differential Revision: https://phabricator.services.mozilla.com/D72025

browser/components/customizableui/content/panelUI.inc.xhtml

@@ -815,7 +815,7 @@
 
     <panelview id="PanelUI-fxa" title="&fxa.menu.account.label;" class="PanelUI-subView" descriptionheightworkaround="true">
       <vbox id="PanelUI-fxa-menu" class="panel-subview-body">
-        <toolbarbutton id="fxa-manage-account-button" flex="1"
+        <toolbarbutton id="fxa-manage-account-button"
                        align="center"
                        class="fxa-menu-header subviewbutton"
                        oncommand="gSync.clickFxAMenuHeaderButton(this);">

browser/themes/shared/customizableui/panelUI.inc.css

@@ -750,10 +750,6 @@ toolbarbutton[constrain-size="true"][cui-areatype="menu-panel"] > .toolbarbutton
 
 .fxa-menu-header {
   padding-block: 8px 4px;
-  /* Important is here to ensure that the proper header height is fixed
-     regardless if opened from browser icon or under app menu.
-  */
-  max-height: 46px !important;
 }
 
 #fxa-menu-header-title {