Removed deprecated SCI_GETSTYLEBITS call for Notepad++ 7.7 update.

[vinsworldcom]

Possible fix for #7

Original code:
int bits = (int)SendMessage(hScintilla, SCI_GETSTYLEBITS, 0, 0); unsigned char mask = 0xFF >> (8-bits);

SCI_GETSTYLEBITS deprecated
It always returned 8, so we use bits=8 and then a shift of 8-8=0 does nothing

This should fix for Notepad++ 7.7 above (new Scintilla), as well as stay backward compatible with older Notepad++ < 7.7.

Further discussion

[chcg]

Seems also the masking could be removed completely as

csd->dataBuffer[i*2+1] &= 0xFF;

will not change data anyhow.

Issue is probably due to changed define INCLUDE_DEPRECATED_FEATURES, so

https://github.com/notepad-plus-plus/notepad-plus-plus/blob/master/scintilla/src/Editor.cxx#L7071-L7078

is not compiled anymore and the return value is no longer 8.