gui: fix check for mcpi repo (remove ']')

gui

@@ -101,7 +101,7 @@ EOF
 
 #remove old mcpi repositories
 runonce <<"EOF"
-  if [ -f /etc/apt/sources.list.d/mcpi-revival.list ] && cat /etc/apt/sources.list.d/mcpi-revival.list | grep -q 'https://mcpirevival.tk/mcpi-packages' ];then
+  if [ -f /etc/apt/sources.list.d/mcpi-revival.list ] && cat /etc/apt/sources.list.d/mcpi-revival.list | grep -q 'https://mcpirevival.tk/mcpi-packages' ;then
     echo 'deb [trusted=yes] https://mcpi-revival.github.io/mcpi-packages/ buster main' | sudo tee /etc/apt/sources.list.d/mcpi-revival.list
   fi
   if [ -f /etc/apt/sources.list.d/Alvarito050506_mcpi-devs.list ];then