Change LibreWolf to standalone browser type

- Reverted Firefox regex changes
- Added LibreWolf as a standalone browser in parser-browsers.js
- Added LibreWolf to BROWSER_ALIASES_MAP and BROWSER_MAP in constants.js
- Created LibreWolf section in useragentstrings.yml with updated test expectations
- LibreWolf is now detected as "LibreWolf" instead of "Firefox"

Co-authored-by: naorpeled <6171622+naorpeled@users.noreply.github.com>

test/acceptance/useragentstrings.yml

@@ -1915,11 +1915,12 @@
         engine:
           name: "WebKit"
           version: "605.1.15"
+  LibreWolf:
     -
       ua: "Mozilla/5.0 (X11; Linux x86_64; rv:124.0) Gecko/20100101 LibreWolf/124.0.2"
       spec:
         browser:
-          name: "Firefox"
+          name: "LibreWolf"
           version: "124.0.2"
         os:
           name: "Linux"