do not handle bitNumber wheh NUMKEYS is 0

[coliss86]

Hi,

here is a fix when NUMKEYS=0. Previously, I had a compilation error:

❯ pio run
...
Compiling .pio/build/micro/src/spaceKeys.cpp.o
Compiling .pio/build/micro/src/spacemouse-keys.ino.cpp.o
In file included from spacemouse-keys/hidInterface.cpp:2:0:
spacemouse-keys/config.h:188:48: error: too many initializers for 'uint8_t [0] {aka unsigned char [0]}'
 #define BUTTONLIST { SM_FIT, SM_T, SM_R, SM_CA }
                                                ^
Compiling .pio/build/micro/FrameworkArduino/HardwareSerial0.cpp.o
spacemouse-keys/hidInterface.cpp:8:33: note: in expansion of macro 'BUTTONLIST'
 uint8_t bitNumber[NUMHIDKEYS] = BUTTONLIST;
                                 ^~~~~~~~~~
Compiling .pio/build/micro/FrameworkArduino/HardwareSerial1.cpp.o
*** [.pio/build/micro/src/hidInterface.cpp.o] Error 1
========================================================================= [FAILED] Took 0.72 seconds =========================================================================

Now, it doesn't fail :muscle:

Regards

[AndunHH]

Yes! Thanks for fixing this!