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

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https://hg.mozilla.org/integration/gaia-central/rev/1df48d6e1039
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #15899 from leob2g/Bug_946025_Enabling_wifi_hotspot_without_a_SIM_card_inserted_does_not_prompt_user

Bug 946025 - [B2G][Settings][Internet Sharing] Enabling Wi-fi hotspot without a SIM card inserted does not prompt user, r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/e405f93d8214
Author: sungwoo.yoon <sungwoo.yoon@lge.com>
Desc: Bug 946025 : [B2G][Settings][Internet Sharing] Enabling Wi-fi hotspot without a SIM card inserted does not
Bumping manifests a=b2g-bump