rebench-denoise restore is not done between build commands

[smarr]

Without the restore, the system resources are severely restricted which dramatically increase build times etc.

The issue is likely something like this:

1. build command execute
2. benchmark started, for it, denoise is used
3. then we do not do restore to not have to do it every time
4. then we build another thing but are very restricted

So, I think, to keep avoiding minimizing/restoring settings all the time, we'd want to at least restore things before a build, and then minimize it when next needed.

This should also consider this issue: #168