Miniheap pairs are not properly checked for isMeshingCandidate()

[Keith Newton]

While meshing all size classes the meshFound callback only checks one of the miniheaps for each miniheap pair if it is a meshing candidate.

Mesh/src/global_heap.cc

Line 253 in 6524683

 if (std::get<0>(miniheaps)->isMeshingCandidate() && std::get<0>(miniheaps)->isMeshingCandidate()) 

should be:

if (std::get<0>(miniheaps)->isMeshingCandidate() && std::get<1>(miniheaps)->isMeshingCandidate())

[Bobby Powers]

wow, great find. It looks like I fat-fingered this in a refactor at the end of 2017:
816ba1f#diff-5e53b77d66403f5bb04fab8563dc8e80L394-L396

[Bobby Powers]

thanks @Corillian ! amazing find