opensubtitles: Fix blank dialogue when reopened

Merged Bastien Nocera requested to merge wip/hadess/opensubtitles-reopen into master

totem_plugin_load_interface() used to call totem_interface_load_with_full_path() which itself called gtk_builder_connect_signals().

And as we didn't do that anymore when we started loading the file ourselves, gtk_widget_hide_on_delete() wasn't called so the dialogue was destroyed which we didn't expect.

With help from Krifa75

Fixes: 2001dfee ("opensubtitles: Fix dialogue not showing up")

Closes: #549 (closed)

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