Small script cleanup (ublue-os#1193)

Couple of bash quote potential issues fixes

Author: RodoMa92

system_files/desktop/shared/usr/share/ublue-os/just/rmlint-override.conf

@@ -13,7 +13,7 @@ ExecStartPre=-compsize %f/
 ExecStart=rmlint --hidden --types="duplicates" --config=sh:handler=clone %f/
 ExecStart=sh -c 'exec ./rmlint.sh -d -p -r -k'
 ExecStart=-compsize %f/
-ExecStart=-sh -c '[ "$(sqlite3 -readonly duperemove.hash "SELECT keyval FROM config where keyname=''version_major''")" -ge 4 ] || rm -f duperemove.hash'
+ExecStart=-sh -c "[ $(sqlite3 -readonly duperemove.hash \"SELECT keyval FROM config where keyname='version_major'\") -ge 4 ] || rm -f duperemove.hash"
 ExecStart=duperemove -r -d -h -q --hashfile=duperemove.hash --skip-zeroes --exclude="%f/.duperemove.hash" --exclude="%f/@swapfile/swapfile" %f/
 ExecStartPost=-compsize %f/
 ExecStopPost=-cp -a duperemove.hash %f/.duperemove.hash