message: genesis: Reduce number of predeploys
  We were creating 65k predeploys, which made a huge genesis file. This PR reduces that to 2048.
diff: @@ -144,7 +144,7 @@ task('genesis-l2', 'create a genesis config')
  // Set a proxy at each predeploy address
  const proxy = await hre.artifacts.readArtifact('Proxy')
  - for (let i = 0; i <= 0xffff; i++) {
  + for (let i = 0; i <= 2048; i++) {
  const num = ethers.utils.hexZeroPad('0x' + i.toString(16), 2)
  const addr = ethers.utils.getAddress(
  ethers.utils.hexConcat([prefix, num])
  