status/system: Use a better icon in screenshot button

The screenshot button could be mistaken for one that opens a
program for taking photos and videos. Change it to one that
is less ambiguous.

https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/5993

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2553>

js/ui/status/system.js

@@ -100,7 +100,7 @@ class ScreenshotItem extends QuickSettingsItem {
         super._init({
             style_class: 'icon-button',
             can_focus: true,
-            icon_name: 'camera-photo-symbolic',
+            icon_name: 'screenshooter-symbolic',
             visible: !Main.sessionMode.isGreeter,
             accessible_name: _('Take Screenshot'),
         });