[LE Broadcast] Fix crash when scan QR code

Crash happens when rotated screen.

QrCodeScanModeFragment should only have default constructor.

Remove unused params to fix.

To start this page,
adb shell am start \
    -a android.settings.BLUETOOTH_LE_AUDIO_QR_CODE_SCANNER

Fix: 287363885
Test: Manually
Change-Id: I3c4bcfdb8ae6ddf750e16d8e7565cb9d45d11788