Remove usage of pidgin_conv_is_hidden from transparency plugin

Review Request #1139 — Created Nov. 23, 2021 and submitted — Latest diff uploaded

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pidgin/pidgin
default

Reviewers

This plugin is only used on Windows so that's probably why we didn't notice
that it used this function when we deprecated it a few weeks ago.

Compiled on Windows and verified the plugin can be enabled without crashing. Couldn't test it with a conversation since Pidgin3 on Windows crashes for me when I try to add a new account.

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