Comment 7 for bug 1920825

Here is my proposal:
* dh-exec today desires to remove whitespace after a profile, so preserve that
* dh-exec also removes trailing whitespace, which might be OK and is current behavior, so preserve that
* remove leading whitespace for lines that don't have the profile
My perl is rusty (to say the least) but nonetheless here is my proposal. I have not given this regression test yet beyond the built-in tests.