healthcheck.pl: Fixed disk size output
healthcheck.pl: Fixed disk size output

- Fixed missing base "K" as input for bytes_humanreadable()
- Reduzed warning size from logdb and notifydb to 20MB (was 50MB)

mschlenstedt/Loxberry,mschlenstedt/Loxberry,mschlenstedt/Loxberry,mschlenstedt/Loxberry,mschlenstedt/Loxberry,mschlenstedt/Loxberry