UTCheckers: remove stray argument in plot calls
Fixes warnings like
../UT/UTCheckers/src/MCUTDigitMonitor.cpp:85:71: warning: implicit conversion from 'double' to 'unsigned long' changes value from 764.8 to 764 [-Wliteral-conversion]
plot2D( hitX, hitY, "UTDigits X vs. Y", 4, -908.6, 908.6, -764.8, 764.8, 76, 32 );
~~~~~~ ^~~~~
Edited by Christopher Rob Jones