lib: virgo_lua_logging: fix compiler warning
lib: virgo_lua_logging: fix compiler warning

lib/virgo_lua_logging.o ../lib/virgo_lua_logging.c
../lib/virgo_lua_logging.c:31:30: warning: comparison of integers of different signs: 'virgo_log_level_e' and 'int' [-Wsign-compare]
  if (virgo_log_level_get(v) < loglevel) {
      ~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~

kans/birgo,kans/birgo,kans/birgo,kans/birgo,kans/birgo