Remove dpi scaling of maximum width

[Caellian]

This PR removes dpi_scaleing of maximum width setting.

This seems incorrect because I expect maximum width to use absolute pixel value, otherwise meaning of maximum_width setting changes with DPI:

_{NOTE: Height difference is caused by font height, conky height can't be limited.}

This fixes #1528.

This PR also fixes a regression introduced in #1841, where I incorrectly assumed templated base class function would be overriden by display outputs so DPI scaling was completely disabled.

Other changes

This PR also:

• sets workspace dimensions from WL output_geometry because workspace is used for some calculations in conky.cc.
  • this requires more work for proper support as noted in comments, but it should make Wayland less broken.
• adds conky xdg dir and script parent directory to Lua path so that scripts don't have to update it manually.

Testing

• [x] Use mock Xft dpi value and see whether example from #1528 works better with/without this PR.

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