Bumping gaia.json for 1 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/782829c16d30
Author: b2gautomation <jonallengriffin@gmail.com>
Desc: Update gaia-ui-tests.json; Merge pull request #1359 from zacc/unxfail_tests2

Unxfail tests2

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "cdf75f3e9e3accee629b2b9457d69f9220d60947", 
+    "revision": "782829c16d300afacb7a94a8ec7cdc4339f2032c", 
     "repo_path": "/integration/gaia-central"
 }