Bug 1065485: Don't decode-to-encode default favicons. r=rnewman

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rename : mobile/android/base/resources/drawable-mdpi/bookmarkdefaults_favicon_addons.png => mobile/android/base/resources/raw/bookmarkdefaults_favicon_addons.png
rename : mobile/android/base/resources/drawable-mdpi/bookmarkdefaults_favicon_marketplace.png => mobile/android/base/resources/raw/bookmarkdefaults_favicon_marketplace.png
rename : mobile/android/base/resources/drawable-mdpi/bookmarkdefaults_favicon_support.png => mobile/android/base/resources/raw/bookmarkdefaults_favicon_support.png