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Fix crash in debug dialog

Tobias Fella requested to merge work/tobias/fix-debug-dialog-crash into master

When running a command that doesn't terminate (e.g., "gpg") and closing the window, the process for the command is killed, causing QProcess::errorOccurred to be emitted. We're connecting to this signal to change UI elements, which have already been deleted at this point. This patch fixes that by changing the connections to have the UI components as receiver, which makes them disconnect when the objects are destroyed

GnuPG-Bug-ID: 7331

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