Bumping gaia.json for 2 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/f562946cc130
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #13240 from davidflanagan/bug884752-v1.2

Merge pull request #13106 from davidflanagan/autocorrect-config2

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https://hg.mozilla.org/integration/gaia-1_2/rev/5f5e96db609e
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #13106 from davidflanagan/autocorrect-config2

Bug 884752: make keyboard layouts and autocorrect dictionaries configurable at build time r=rlu,yurneju,pike(cherry picked from commit 9b0ea7a308cc99fb389e503c63dc7792692247c9)

Conflicts:

	Makefile
	apps/keyboard/js/layout.js