scripts: run-demo.sh: don't set vsize limit in script
scripts: run-demo.sh: don't set vsize limit in script

Some drivers may have very high virtual size usage (usually by creating
large mappings). Since those script can by used on a wide range of
drivers, we remove here the ulimit -S -v. It's now the responsibility of
the caller to set its own limit.

Signed-off-by: Julien Olivain <7fdfe229fce69a4d7f38653f3755ccbae5703f88@cotds.org>

jolivain/glslsandbox-player,jolivain/glslsandbox-player,jolivain/glslsandbox-player,jolivain/glslsandbox-player