[FM] FM recording file which has the same name will be saved after changing language

    FM recording file "a" has been saved -> Launch FM
    and start a FM recording and stop it, type a name
    as "a" -> Tap home key and enter settings to change
    language -> Launch FM again and tap SAVE, 'a already
    exists' do not display and FM recording file can be saved.

    The fix is to update some private variables when calling
    onCreateDialog().

    Bug 18826609

    Review: https://partner-android-review.git.corp.google.com/#/c/189793



Signed-off-by: Benson Huang <benson.huang@mediatek.com>

Change-Id: I3492566267b971ce7bbc15ae4ed30961a9308d25