deal.II Example Updates

[jeremylt]

fixes #1862
fixes #1858

This PR does two things

1. I accidentally got too fancy and provided incorrect values for the libCEED bases being constructed, leading to incorrect convergence. This fixes that

2. Now this example does not do the extra data copying for BP2 and BP4

[jeremylt]

Removing the copies improves the performance (mild but noticable):

New:

$ build/dealii-bps --resource /cpu/self --bp BP1 --fe_degree 3 --n_refinements 4
ceed: 11 277944 0.00348648
dealii: 11 277944 0.0319286
$ build/dealii-bps --resource /cpu/self --bp BP2 --fe_degree 3 --n_refinements 4
ceed: 11 393072 0.00572181
dealii: 11 393072 0.0601282
$ build/dealii-bps --resource /cpu/self --bp BP3 --fe_degree 3 --n_refinements 4
ceed: 75 4559.6 0.0263361
dealii: 75 4559.6 0.412881
$ build/dealii-bps --resource /cpu/self --bp BP4 --fe_degree 3 --n_refinements 4
ceed: 75 6448.24 0.0481876
dealii: 75 6448.24 0.78902

Old:

$ build/dealii-bps --resource /cpu/self --bp BP1 --fe_degree 3 --n_refinements 4
ceed: 11 277944 0.00345421
dealii: 11 277944 0.0324943
$ build/dealii-bps --resource /cpu/self --bp BP2 --fe_degree 3 --n_refinements 4
ceed: 11 393072 0.00892214
dealii: 11 393072 0.0616518
$ build/dealii-bps --resource /cpu/self --bp BP3 --fe_degree 3 --n_refinements 4
ceed: 75 4559.6 0.028057
dealii: 75 4559.6 0.419625
$ build/dealii-bps --resource /cpu/self --bp BP4 --fe_degree 3 --n_refinements 4
ceed: 75 6448.24 0.0599387
dealii: 75 6448.24 0.834815