Bumping gaia.json for 4 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/172a3533ef8f
Author: Fernando Rodríguez Sela <frsela@tid.es>
Desc: Merge pull request #12965 from frsela/STK/Bug928582

Bug 928582 - STK: No terminal response sent for PLAY_TONE and tone plays forever when missing DURATION, r=kaze

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https://hg.mozilla.org/integration/gaia-central/rev/c2d1a1498b0c
Author: Fernando Rodríguez Sela <frsela@tid.es>
Desc: Bug 928582 - STK: No terminal response sent for PLAY_TONE and tone plays forever when missing DURATION

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https://hg.mozilla.org/integration/gaia-central/rev/6377f47a454e
Author: Fernando Rodríguez Sela <frsela@tid.es>
Desc: Merge pull request #13343 from frsela/STK/Bug920983

Bug 920983 - [Buri][STK] After entering second layer menu and press backkey, or after enabling or canceling one service, it won't go back to first layer of the menu but to Settings., r=kaze

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https://hg.mozilla.org/integration/gaia-central/rev/131d9a5bb828
Author: Fernando Rodriguez Sela <frsela@tid.es>
Desc: Bug 920983 - [Buri][STK] After entering second layer menu and press back key, or after enabling or canceling one service, it won't go back to first layer of the menu but to Settings.