Update IntentProcessor implementation to comply with new interface

[pocmo]

We changed the Fenix implementation in #8823. And removed matches() from the interface in AC in mozilla-mobile/android-components#6097. Now we can remove the override keyword from the IntentProcessor implementations living in Fenix.

[pocmo]

Oh, missed the tests. Updating!

[codecov-io]

Codecov Report

Merging #8971 into master will increase coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #8971      +/-   ##
============================================
+ Coverage      18.9%   18.94%   +0.03%     
- Complexity      500      502       +2     
============================================
  Files           330      330              
  Lines         13043    13043              
  Branches       1725     1725              
============================================
+ Hits           2466     2471       +5     
+ Misses        10367    10361       -6     
- Partials        210      211       +1

Impacted Files	Coverage Δ	Complexity Δ
...e/intent/FennecBookmarkShortcutsIntentProcessor.kt	91.66% <ø> (+8.33%)	5 <0> (+2)	⬆️
...la/fenix/shortcut/NewTabShortcutIntentProcessor.kt	0% <ø> (ø)	0 <0> (ø)	⬇️
...la/fenix/customtabs/FennecWebAppIntentProcessor.kt	0% <ø> (ø)	0 <0> (ø)	⬇️
...nix/components/toolbar/BrowserToolbarController.kt	64.53% <0%> (+2.32%)	0% <0%> (ø)	⬇️

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