Raise minimum AAVE holding to create a snapshot proposal to 50 AAVE

current minimum to create a snapshot proposal is 1 AAVE.

While it's important to have a snapshot proposal process that is open to most community members, this snapshot page as many other snapshot pages is currently a victim of spam proposals.

spam proposal makes the governance process less clear and add friction.

increasing the minimum requirement to a higher amount might help mitigate the Spam issue while staying in a range that is accessible to a very large part of the community.

Votes would still not have a minimum allowing anyone, regardless of their holdings to have a vote in the snapshot process.