xdefaults: urxvt: remove C-{h,l} bindings
xdefaults: urxvt: remove C-{h,l} bindings

This way, we can finally cycle through vim and emacsclient tabs. The
fact that terminal Vim and Emacs both relied on these bindings all this
time shows just how infrequently they were used (_terminal_ Vim/Emacs)
for serious development.

Scrolling up/down by 1 line (the old behavior of C-{j,k}) is not useful
enough to justify keeping this logic around.

listx/syscfg,listx/syscfg,listx/syscfg,listx/syscfg,listx/syscfg