Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/54d21654d085
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #18730 from Rik/suggestion-list-995128

Bug 995128 - Suggestion list should use the building block action menu r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/3daa93d66711
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 995128 - Suggestion list should use the building block action menu

- Move the suggestion-item to an HTML import
- Prefix all classes used for JS DOM selection
- Remove the transition when the overlay opens since it was not visible on device
- Reorganise the test file to separate SuggestionBar and SuggestionList tests
- Add some new tests
- Move suggestion bar related styles out of keypad.css
- Used the BEM syntax for classes
Bumping manifests a=b2g-bump