44f15cfdcfc64d5a0c36fded39e4aef49415b11b gui: renamed 'debug window' to 'node window' (Zero)
Pull request description:
**Edit**: I have now limited the change in this PR to only renaming the window title from `Debug Window` to `Node Window`. Check [this comment](https://github.com/bitcoin/bitcoin/pull/17096#issuecomment-542837511) for more details. This PR is in response to #17082, which aims to rename the `Debug window` title to a more user friendly term; `Node window`. Closes #17082
Backport of Core PR17096