run-qemu.sh: simplify; source the SEALS config file to get the env (incl STG)
run-qemu.sh: simplify; source the SEALS config file to get the env
(incl STG)

Signed-off-by: Kaiwan N Billimoria <fa1a3e3b466220464633d3d059e197d2b0227601@gmail.com>

kaiwan/seals