Revert "Bug 849876 - [B2G][FM radio] Blank white screen is shown when launching FM radio r=alive"

This reverts commit fd4ea06450fd6d83f4177c338b55c3e1de02e6d5.
Bug 849876 - [B2G][FM radio] Blank white screen is shown when launching FM radio r=pzhang

Revert an unfortunate change from bug 841353