add `-001` to writing-mode-horizontal-ref.html

prepping for rtl testcase, add numbers to the current unnumbered reference file
for text-combine-uprighg in horizontal writing modes.
add rtl testcase for text-combine-upright in horizontal writing-modes

writing-mode-horizontal-002 has `direction: rtl` set.

also fix the stupid mistake I made for 001: there's no `horizontal-lr`.

there's no `horizontal-lr`.