Move ECDSAContractAccount + ProxyEOA into predeploys

[smartcontracts]

Is your feature request related to a problem? Please describe.
OVM_ECDSAContractAccount and OVM_ProxyEOA are predeployed contracts that are currently sitting in their own accounts folder. I'd like to move them into the predeploys folder instead.

Describe the solution you'd like
I'd like to move OVM_ECDSAContractAccount and OVM_ProxyEOA into the predeploy folders. I don't really see the need for a separate accounts folder, especially since these contracts are indeed predeployed.

[maurelian]

Seems reasonable to me!