skip all the byecode hex data, it's adequately checked

... by the disassembly just below

This was tripped up because in exactly the right conditions some qstr
could be of the form 'xx 63' and make the expression `\.\+63` match
something other than what was intended.

This test was re-worked upstream for mpy version 6 so it'll be a conflict
to resolve when we get to that. :-/

tests/cmdline/cmd_showbc.py.exp

@@ -1,7 +1,6 @@
 File cmdline/cmd_showbc.py, code block '<module>' (descriptor: \.\+, bytecode @\.\+ bytes)
 Raw bytecode (code_info_size=\\d\+, bytecode_size=\\d\+):
 ########
-\.\+63
 arg names:
 (N_STATE 3)
 (N_EXC_STACK 0)