dinfo: fixed 16 output of some entries

[SvOlli]

The following entries were not displayed, when number required 16 bits

• Directory Entries
• Checked Entries
• Reserved Sectors

Edit: also replaced few remaining tabs with spaces

[davidgiven]

Thanks!

BTW, the CP/M-65 version of the print string bdos operation accepts \0 as a terminator (because life was too short)...