Fixes #60 - Multiple SWAP's breaks output

[Mai-Lapyst]

DOOL VERSION

Dool 1.3.0

SUMMARY

Removes the hardcoded self.name = 'swap' line from the dool_swap plugin.
This has the fixes the broken output and calls def name(self) correctly.

This might be a breaking change, since the name changes from swap to swp/total, when only using --swap without --full or a custom -S.

Before:

$ dool --epoch --swap -S /dev/sdb4,/dev/sda4,total --aio
┄┄epoch┄┄┄┬┄┄┄┄swap┄┄┄┬async
  epoch   │ used  free│ #aio
1699676083│   0    10G┊   0    10G┊   0    20G│ 576B
1699676084│   0    10G┊   0    10G┊   0    20G│ 576B

$ dool --epoch --swap --aio
┄┄epoch┄┄┄┬┄┄┄┄swap┄┄┄┬async
  epoch   │ used  free│ #aio
1699676029│   0    20G│ 576B
1699676030│   0    20G│ 576B

After:

$ dool --epoch --swap -S /dev/sdb4,/dev/sda4,total --aio
┄┄epoch┄┄┄┬┄┄swp/sdb4┄┄┄┄swp/sda4┄┄┄swp/total┄┬async
  epoch   │ used  free  used  free  used  free│ #aio
1699676353│   0    10G┊   0    10G┊   0    20G│ 576B
1699676354│   0    10G┊   0    10G┊   0    20G│ 576B

$ dool --epoch --swap --aio                             
┄┄epoch┄┄┄┬┄swp/total┄┬async
  epoch   │ used  free│ #aio
1699676376│   0    20G│ 576B
1699676377│   0    20G│ 576B