stop backcomputing affected WFOs for VTEC

[akrherz]

closes #615

[codecov]

Codecov Report

Merging #621 (6684924) into main (ee4494a) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #621   +/-   ##
=======================================
  Coverage   96.66%   96.66%           
=======================================
  Files          78       78           
  Lines        9249     9249           
=======================================
  Hits         8941     8941           
  Misses        308      308           

Impacted Files	Coverage Δ
src/pyiem/nws/products/_vtec_jabber.py	95.93% <100.00%> (ø)

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