Fix wrong body css while toggling visibility

Closes #648 (closed)

"display: initial" caused the issue. we can avoid this using css class.

mentioned in merge request !924 (closed)

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• 790a882d - refactor toggling body visibility using class

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• d6d8e51d - refactor toggling body visibility using class

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• 6ba085c5 - refactor toggling body visibility using class

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• 948827af - refactor toggling body visibility using class

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• 2f9abd71 - refactor toggling body visibility using class

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• aa55f073 - refactor toggling body visibility using class

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• aa55f073...e75ac9dd - 2 commits from branch pleroma:develop
• ea5b36a5 - refactor toggling body visibility using class

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merged

mentioned in commit a4a4c46f