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

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https://hg.mozilla.org/integration/gaia-central/rev/5c1589978f8e
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #21126 from KevinGrandon/land_bug_1027144

Revert "Revert "Bug 1027144 - Re-enable test_homescreen_move_app.py" for intermittent test failures"

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https://hg.mozilla.org/integration/gaia-central/rev/13eca3ae141e
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Revert "Bug 1027144 - Re-enable test_homescreen_move_app.py" for intermittent test failures"

This reverts commit a0807151b0b28feb59b323a30b1f74dc8801be32.

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https://hg.mozilla.org/integration/gaia-central/rev/314cadee9543
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #20942 from DouglasSherk/1021175-callscreen-incorrect-wallpaper

Bug 1021175 - [Dialer] Fix incorrect wallpaper shown if the user changes it. r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/2ccfb999b4e4
Author: DouglasSherk <github@sherk.me>
Desc: Bug 1021175 - [Dialer] Fix incorrect wallpaper shown if the user changes it. r=etienne

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "38469787521cc925aba818f278a7769d625bb513", 
+    "revision": "5c1589978f8e1060fcc92787741f63bfb67430a7", 
     "repo_path": "/integration/gaia-central"
 }