Apply suggestions from code review

Co-authored-by: Adam Warner <me@adamwarner.co.uk>
Signed-off-by: yubiuser <ckoenig@posteo.de>

gravity.sh

@@ -699,7 +699,6 @@ gravity_ParseFileIntoDomains() {
   # 3) Remove lines starting with ! (ABP Comments)
   # 4) Remove lines starting with [ (ABP Header)
   # 5) Remove lines containing ABP extended CSS selectors ("##", "#!#", "#@#", "#?#") preceded by a letter
-  # 6) Remove lines containing Adguard JavaScript rules ("#%#") preceded by a letter
   # 7) Remove comments (text starting with "#", include possible spaces before the hash sign)
   # 8) Remove leading tabs, spaces, etc. (Also removes leading IP addresses)
   # 9) Remove empty lines
@@ -708,8 +707,7 @@ gravity_ParseFileIntoDomains() {
     -e 's/\r$//' \
     -e 's/\s*!.*//g' \
     -e 's/\s*\[.*//g' \
-    -e '/[a-z]\#[$?@]{0,1}\#/d' \
-    -e '/[a-z]\#%\#/d' \
+    -e '/[a-z]\#[$?@%]{0,3}\#/d' \
     -e 's/\s*#.*//g' \
     -e 's/^.*\s+//g' \
     -e '/^$/d' "${destination}"