[Grbl_Esp32 PR#52] Changed status report number format for FS: and F: fields

Changed FS and F field values from floats to integers.
This change was made to be compatible with LaserGRBL status report parsing (which will not tolerate FS: report with floats), and to be more closely aligned with GRBL real time status report specification documentation, which shows int values in this field rather than floats in the example.