Downscale screenshots

data/com.raggesilver.BlackBox.appdata.xml.in

@@ -34,11 +34,11 @@
   <screenshots>
     <screenshot type="default">
       <caption>Black Box screenshot</caption>
-      <image>https://i.imgur.com/AzxyHwA.png</image>
+      <image>https://i.imgur.com/b73gjQr.png</image>
     </screenshot>
     <screenshot>
       <caption>Black Box with header bars turned off</caption>
-      <image>https://i.imgur.com/xxtFYc5.png</image>
+      <image>https://i.imgur.com/2zH4FIj.png</image>
     </screenshot>
   </screenshots>