[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Incorrect literal Character encoding/decoding in SistaV1 bytecode set (Issue #618)

[Eliot Miranda]

I think both image and VM have to be fixed.  This was a slip by me; apologies.  Clearly, the bytecode is wrongly specified.  Instead of taking the signed extension B it should take the unsigned extension A.  This was a copy-paste error copying the push integer bytecode.  So instead of
```233		11101001	i i i i i i i i	Push Character #iiiiiiii (+ Extend B * 256)```
the bytecode should be
```233		11101001	i i i i i i i i	Push Character #iiiiiiii (+ Extend A * 256)```.
I will make both of these changes.

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