Update com.rtosta.zapzap.appdata.xml

Author: rafatosta

share/metainfo/com.rtosta.zapzap.appdata.xml

@@ -87,7 +87,7 @@
     <screenshot>
       <caption>Theme integration</caption>
       <image type="source" xml:lang="en">
-        https://raw.githubusercontent.com/rafatosta/zapzap/v6.5.3/share/screenshots/zapzap-dark-theme.png
+        https://raw.githubusercontent.com/rafatosta/zapzap/7.0/share/screenshots/zapzap-dark-theme.png
       </image>
     </screenshot>
   </screenshots>