releasetools: Use bsdiff for recovery patch by default

[Joker-commits]

• imgdiff seems to have issues setting recovery bonus data, most probably due to libz from zlib-ng breaking it:

imgdiff W 08-05 00:09:03 245235 245235 imgdiff.cpp:1408] Failed to reconstruct target deflate chunk 3 []; treating as normal imgdiff E 08-05 00:09:03 245235 245235 imgdiff.cpp:1363] Failed to set bonus data

Traceback (most recent call last): File "/roms/wave/out/host/linux-x86/bin/make_recovery_patch/internal/stdlib/runpy.py", line 174, in _run_module_as_m ain File "/roms/wave/out/host/linux-x86/bin/make_recovery_patch/internal/stdlib/runpy.py", line 72, in _run_code File "/roms/wave/out/host/linux-x86/bin/make_recovery_patch/main.py", line 12, in File "/roms/wave/out/host/linux-x86/bin/make_recovery_patch/internal/stdlib/runpy.py", line 174, in _run_module_as_m ain File "/roms/wave/out/host/linux-x86/bin/make_recovery_patch/internal/stdlib/runpy.py", line 72, in _run_code File "/roms/wave/out/host/linux-x86/bin/make_recovery_patch/make_recovery_patch.py", line 73, in File "/roms/wave/out/host/linux-x86/bin/make_recovery_patch/make_recovery_patch.py", line 69, in main File "/roms/wave/out/host/linux-x86/bin/make_recovery_patch/common.py", line 3062, in MakeRecoveryPatch File "/roms/wave/out/host/linux-x86/bin/make_recovery_patch/make_recovery_patch.py", line 67, in output_sink TypeError: argument 1 must be string or buffer, not None