ts: reindent and rearrange a few bash tests

[ThomasAdam]

Bring the style of ts(1) more inline with bash scripts, by:

• Reindenting to a tabstop of 4 (including shift-width and soft tabs);

• Rearranging some test conditions in the form:

  [ foo = "$1" ]

  to:

  [ $1" = "foo" ]

No functional changes made.

[thinkerbot]

See #14 for reasons why I'm closing. Thank you anyhow!