ci(core): add a missing `BITCOIN_ONLY` definition to `core-hw.yml` #4473

Job	Run time
Emulator (universal, debuglink, x86_64, noasan)	3m 26s
Emulator (btconly, debuglink, x86_64, noasan)	3m 18s
Emulator arm	0s
Firmware (universal, debuglink)	4m 0s
Firmware (btconly, debuglink)	3m 48s
Upgrade test (noasan)	4m 32s
Device test (universal, noasan)	8m 29s
Upload emulator binaries	0s
Device test (btconly, noasan)	4m 36s
HWI test	0s
UI diff from main branch	2m 22s
	34m 31s

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