Starting by setting some special initial output config values settings
was something sway used to do when the config was initially being
processed. This was later changed to always happen, as there shouldn't
be differences in how output config is calculated during config load and
after.
Most of these values are redundant, as they are either the zero value or
a value that would be selected if the unset (-1) value was found.
For output transforms, the automatic panel orientation code would only
trigger if the final output config has an unset transform, which the
initial values set in find_output_config made impossible.
Remove these initial values and instead use a fresh output config as is.
Kenny Levinsen