test: cover recheckDeviceStatus catch branch

[TaprootFreak]

Summary

• Adds one missing test for the catch block in recheckDeviceStatus() (lines 242–245 in connect_bitbox_cubit.dart)
• The scenario: device was uninitialized on first pair → BitboxNotInitialized; user sets up wallet; recheckDeviceStatus is called but createBitboxWallet throws → cubit must fall back to BitboxNotConnected
• Fixes Coverage Floor Gate failing at 99.9% (4924/4928 lines) in PR Promote: staging -> develop #728

Test plan

• flutter test test/screens/hardware_connect_bitbox/bloc/connect_bitbox_cubit_test.dart passes
• Coverage Floor Gate reaches 100%