bayestar_localize_coincs: omit method strings from filenames

The script `bayestar_localize_coincs` indicates the sky localization
method in output filenames with suffixes like `.toa_phoa_snr.fits`
or `.toa_phoa_snr_mcmc.fits`.

However, it is very rare to actually run BAYESTAR with any but the
default localization method (`toa_phoa_snr`). In the interest of
shorter and more readable filenames, let's omit the method suffix
if the user only requests one method.
13 jobs for bayestar-localize-coincs-shorter-output-filenames in 48 minutes and 36 seconds (queued for 46 minutes and 13 seconds)
Status Job ID Name Coverage
  Level0
passed #16217
level0:lal

00:03:49

 
  Level1
passed #16218
level1:lalframe

00:01:38

passed #16219
level1:lalmetaio

00:01:07

passed #16220
level1:lalsimulation

00:04:50

passed #16221
level1:lalxml

00:01:22

 
  Level2
passed #16222
level2:lalburst

00:01:45

passed #16223
level2:lalinspiral

00:04:32

passed #16224
level2:lalpulsar

00:03:24

passed #16225
level2:lalstochastic

00:01:39

 
  Level3
passed #16226
level3:laldetchar

00:01:59

passed #16227
level3:lalinference

00:09:02

 
  Level4
passed #16228
level4:lalapps

00:09:43

 
  Container
passed #16229
dockerize

00:07:06