fix bug with 1-dim model_devi_activation_func

[Ericwang6]

Fix BUG: only activation function in descriptor is updated if 1-dim model_devi_activation_func is provided

[codecov-commenter]

Codecov Report

Merging #484 (21512d3) into devel (7f86e32) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##            devel     #484   +/-   ##
=======================================
  Coverage   32.97%   32.97%           
=======================================
  Files          86       86           
  Lines       14736    14736           
=======================================
  Hits         4859     4859           
  Misses       9877     9877           

Impacted Files	Coverage Δ
dpgen/generator/run.py	68.22% <0.00%> (ø)

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