Fix bug in the BEQ/BEQL/BNEL instructions

* Seems like branches really do love having bugs in them ;)
The bug was noticed when the BEQ instruction was provided 0xffd1 as the offset.
Decompiling with ghidra revealed that the offset was -0xbc or -188 as signed
but with this bug the value would be 261956 which completely broke
the program. Fix this by first casting to int16_t to let the
compiler know that we are giving it a 16bit signed int and then convert
it to int32_t

* In addition make stores/loads bold so I can notice them better, as
log output is starting to incrase exponentially