Fix RuntimeError: could not create signal for _closing
On Ubuntu 20.04 with GTK 3.24.13, importing sugar3.activity.activity fails with RuntimeError: could not create signal for _closing, preceeded by an assertion is_valid_signal_name failed. Cause is upstream 89f955d ("gsignal: Canonicalise signal names at installation time ") which requires application signal names to not start with a hyphen or underscore. Remove the prefix from our signal name. The signal remains reserved and private to the Activity class.master
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