Clean up test_chapel_slicing_inline.py
Clean up test_chapel_slicing_inline.py

For whatever reason, when I was first testing this, having multiple asserts or
asserts in certain places in this test caused py.test to make
test_pych_reduce_add.py fail.  However, after switching git branches, I could
make these changes (which aren't different from before!) and py.test did not
complain.  Computers are weird.

chapel-lang/pychapel,safl/pychapel,safl/pychapel,safl/pychapel,russel/pychapel,safl/pychapel,russel/pychapel,chapel-lang/pychapel,russel/pychapel,chapel-lang/pychapel