Replace screenshots icon with fd.o icon name (#516)

Author: danirabbit

data/gresource.xml

@@ -3,7 +3,6 @@
   <gresource prefix="/io/elementary/settings/keyboard">
     <file compressed="true">Behavior.css</file>
     <file alias="io.elementary.settings.keyboard.applications.svg" compressed="true">applications.svg</file>
-    <file alias="io.elementary.settings.keyboard.screenshots.svg" compressed="true">screenshots.svg</file>
     <file alias="io.elementary.settings.keyboard.windows.svg" compressed="true">windows.svg</file>
   </gresource>
 </gresources>

data/screenshots.svg

@@ -106,7 +106,7 @@ namespace Keyboard.Shortcuts {
             add_action (ref workspaces_group, Schema.WM, _("Move to right workspace"), "move-to-workspace-right");
 
             screenshot_group = {};
-            screenshot_group.icon_name = "io.elementary.settings.keyboard.screenshots";
+            screenshot_group.icon_name = "accessories-screenshot-tool";
             screenshot_group.label = _("Screenshots");
             add_action (ref screenshot_group, Schema.GALA, _("Grab the whole screen"), "screenshot");
             add_action (ref screenshot_group, Schema.GALA, _("Copy the whole screen to clipboard"), "screenshot-clip");