Answer to "Gameboy button diode question"Yup, those are diodes. You can chech the schematic here.
Answer to "How do I bent the pins back where it should be?"It's broke, you will need to replace it. You can find it on Aliexpress for like $4: https://bit.ly/2CH4EwC
Answer to "Possible to install a 3DS screen into an original DS?"It’s impossible without a proper adapter, because they handle different resolutions and protocols.