Move new addrmgr Options type and default to top.
Move new addrmgr Options type and default to top.

Default values near the top of the file is preferrable so they are more
easily spotted.

btcsuite/btcwallet,Stash-Crypto/btcwallet,synrg-labs/btcwallet,jrick/btcwallet,jrick/dcrwallet,decred/dcrwallet,Roasbeef/btcwallet,jrick/dcrwallet,Stash-Crypto/btcwallet,synrg-labs/btcwallet,decred/dcrwallet,btcsuite/btcwallet,Roasbeef/btcwallet,jrick/btcwallet