Shanling Q2 port v2.7

• Fixes Bluetooth playback getting stuck at 00:00 after a sample-rate change, for example from a 44.1 kHz album to a 48 kHz YouTube MP3. The track loaded but never played, and nothing played after it until Rockbox was restarted. Rockbox now reopens the Bluetooth stream at the new rate.

Install by unzipping rockbox.zip over .rockbox on the card; your config.cfg is kept.