[bugfix] Fix PrimaryVariablesSwitch::reset()

resize() does not reset the existing values.
Use assign instead to resest all of the vector's elements.
5 jobs for !2812 with fix/wasswitched
latest detached
Status Name Job ID Coverage
  Trigger
passed full-dune-2.7-clang

passed full-dune-2.7-gcc

passed full-dune-master-gcc

passed minimal-dune-2.7-gcc

 
  Downstream Modules
passed trigger lecture