CMFM: Fix navigation view fade effect

Use OnRelaunchCommandResult listener to finish the fade effect instead of doing in
the async task, to ensure that cancels and failures results will finalize the fade effect.

Change-Id: I872a4f468670dc425d96c9c7dfd5fe05b8d86b89
Signed-off-by: jruesga <jorge@ruesga.com>