Remove repeated tests.

Remove repeated tests.

Since CompressedSparsityPattern and CompressedSetSparsityPattern are now
just typedefs for DynamicSparsityPattern, the only difference between
these (deleted) tests and the versions without '_x's in their names is
a small change in how we loop across the sparsity pattern: the diff
between the version with the '_x' and the version without was always, up
to different classes for the sparsity pattern, either

<       for (CompressedSetSparsityPattern::iterator
<            c = sp.begin(line); c!=sp.end(line); ++c)
<         deallog << c->column() << " ";
---
>       for (unsigned int c=0; c<sp.row_length(line); ++c)
>         deallog << sp.column_number(line,c) << " ";

or

<           for (CompressedSetSparsityPattern::iterator
<                c = sp.block(block_row.first,col).begin(block_row.second);
<                c!=sp.block(block_row.first,col).end(block_row.second); ++c)
<             deallog << c->column()
---
>           for (unsigned int c=0;
>                c<sp.block(block_row.first,col).row_length(block_row.second);
>                ++c)
>             deallog << sp.block(block_row.first,col).column_number(block_row.second,c)

and the outputs were identical.