runqemu: Fix gl-es argument from causing other arguments to be ignored

The code to parse arguments was inadvertently skipping all arguments in
the elif block after gl-es if it was specified on the command line.

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
(cherry picked from commit 718bb8d5)
Signed-off-by: Steve Sakoman <steve@sakoman.com>