fix(factor): Fixed factor bug

[scottrp]

Fixed factor bug where converting data from internal to external can cause the factor to be applied to the data

[codecov]

Codecov Report

Merging #1673 (8c1204e) into develop (72890e1) will decrease coverage by 0.0%.
The diff coverage is 100.0%.

@@            Coverage Diff            @@
##           develop   #1673     +/-   ##
=========================================
- Coverage     71.6%   71.6%   -0.1%     
=========================================
  Files          253     253             
  Lines        55881   55881             
=========================================
- Hits         40054   40053      -1     
- Misses       15827   15828      +1     

Impacted Files	Coverage Δ
flopy/mf6/data/mfdataarray.py	62.5% <100.0%> (ø)
flopy/mf6/data/mfdatastorage.py	70.6% <0.0%> (-0.1%)	⬇️