Revert BRZ keyword back to BZ

[godotalgorithm]

Fixes #168.

Status

• [x] Ready for merge

[codecov[bot]]

Codecov Report

Merging #170 (b717d48) into main (62902af) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #170   +/-   ##
=======================================
  Coverage   66.89%   66.89%           
=======================================
  Files         331      331           
  Lines       73890    73890           
=======================================
  Hits        49428    49428           
  Misses      24462    24462           

Files Changed	Coverage Δ
src/input/wrtkey.F90	64.58% <100.00%> (ø)
src/output/writmo.F90	69.90% <100.00%> (ø)