e exec - fix exec of enlightenment_open to use actual e prefix
e exec - fix exec of enlightenment_open to use actual e prefix

so this code path was using the COMPILED IN prefix like broken
old-school unix apps that cannopt be relocated. efl and e have runtime
prefix detection so use it properly. stop doing things the broken way
just because people have written broken code for 30+ years and
continue to. we don't do that in e/efl land.

@fix

rvandegrift/e,rvandegrift/e,rvandegrift/e