Let escape presses work properly inside HDrawer

Also add escape to clear member filter when focusing the field, and
clearMemberFilterOnEscape setting.

src/gui/Pages/Chat/RoomPane/MemberView.qml

@@ -61,6 +61,11 @@ HColumnLayout {
                 onTextChanged:
                     py.callCoro("set_substring_filter", [modelSyncId, text])
 
+                Keys.onEscapePressed: {
+                    roomPane.toggleFocus()
+                    if (window.settings.clearMemberFilterOnEscape) text = ""
+                }
+
                 Behavior on opacity { HNumberAnimation {} }
             }