fix(core/vendorheader): include correct backup key into trezor_btconly vendor header

core/embed/vendorheader/T2B1/vendor_trezor_btconly.json

@@ -17,6 +17,6 @@
     "pubkeys": [
         "5356eb7e6efc91af67d3821bdd4d30402e92dbbc6c37024ad5b64daf93587ea5",
         "358881680b4c6c0f5aee3c596ec62ad6eecc0b16fb4ff65d50f35ebbab9bbad0",
-        "7e0727439e635e36636661c9f37b481495ad9c0dd82d50c2366b1d4f4ae00b05"
+        "c7747d47fb474d4839280f1d23e78939e71bed04154fbb78293218bcab418f62"
     ]
 }