Fix issue with .uwu failing to uwuify embeds in replies

[AbooMinister25]

Relevant Issues

Closes #1075

Description

In uwu_command, if command was invoked referring to a replied message, store the message's embeds in an embeds variable, otherwise set it to None. Add an else statement in uwu_command after if embed is not None to fallback to embeds which was defined earlier. Add a check in uwu_command to avoid adding a leading >>> if the uwuified content contains only an embed.

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[AbooMinister25]

ah sorry, hold on