fix #194: color not working with ag
fix #194: color not working with ag

It's because ag uses multiple attributes in SGR parameters.
e.g. `\e[1;31m` which means set the attribute to BOLD and forground
color to yellow.

Previously skim's CSI parsing logic will take only the first parameter.

lotabout/skim,lotabout/skim,lotabout/fzf-rs,lotabout/skim