Fix: Invalid YFI & DAI amount and UX fixes

[Majorfi]

• Balance of Remaining to buy was fetched incorrectly
• Balance of Available was based on user's wallet instead of contract balance
• You sell computation was not good due too above errors
• Add an blur on the input on Max click
• Fix the TXHash prepended with function signature

[vercel[bot]]

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Name	Status	Preview	Updated
ybuyback	✅ Ready (Inspect)	Visit Preview	May 17, 2022 at 8:52AM (UTC)