Quick fix: Fall back to on-the-fly exchange for open-shell

[stigrj]

The open-shell exchange error #377 is located in ExchangePotentialD1::setupInternal, so we circumvent the problem by avoiding K.setPreCompute()

[codecov[bot]]

Codecov Report

Merging #380 (d571e11) into master (90d12c9) will decrease coverage by 1.00%. The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master     #380      +/-   ##
==========================================
- Coverage   69.95%   68.95%   -1.01%     
==========================================
  Files         177      177              
  Lines       14110    14111       +1     
==========================================
- Hits         9871     9730     -141     
- Misses       4239     4381     +142     

Impacted Files	Coverage Δ
src/driver.cpp	70.01% <50.00%> (-0.11%)	:arrow_down:
...c/qmoperators/two_electron/ExchangePotentialD1.cpp	16.92% <0.00%> (-48.43%)	:arrow_down:
src/utils/Bank.cpp	19.40% <0.00%> (-17.92%)	:arrow_down:
src/qmoperators/two_electron/ExchangePotential.h	33.33% <0.00%> (-16.67%)	:arrow_down:
src/qmoperators/two_electron/ExchangeOperator.h	93.75% <0.00%> (-6.25%)	:arrow_down:
src/qmoperators/two_electron/ExchangePotential.cpp	90.27% <0.00%> (-5.56%)	:arrow_down:

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[stigrj]

I will investigate the problem