chore(steamos-update): Make progress bar more granular and a bit longer

Extends the length of the progress bar and makes it more granular

system_files/deck/shared/usr/bin/steamos-update

@@ -47,10 +47,10 @@ if command -v ublue-update > /dev/null; then
     fake_progress() {
       local value=0
       while [ ! -f '/tmp/upgrade-check' ]; do
-        sleep 5
+        sleep 3
         if [ ${value} -lt '100' ]; then
           echo ${value}'%'
-          value=$(( value + 3 ))
+          value=$(( value + 1 ))
         fi
       done
       echo 100%