Node fail to start because of "Invalid block reward" on mainnet

[4miners]

Expected behavior

The node should be able to start.

Actual behavior

Node crash with the following error:

[inf] 2018-10-17 15:08:37 | Starting lisk with "mainnet" genesis block.
[inf] 2018-10-17 15:09:17 | Socket Cluster ready for incoming connections
[inf] 2018-10-17 15:09:18 | Releasing enqueued broadcasts
[inf] 2018-10-17 15:09:18 | Queue empty
[inf] 2018-10-17 15:09:18 | Lisk started: 0.0.0.0:8000
[inf] 2018-10-17 15:09:18 | Modules ready and launched
[inf] 2018-10-17 15:09:20 | Blocks 7301593
[inf] 2018-10-17 15:09:20 | Genesis block matched with database
[inf] 2018-10-17 15:09:20 | Validating current block with height 7301593
[inf] 2018-10-17 15:09:20 | Loader->validateBlock Validating block 10273493690874969091 at height 7301593
[ERR] 2018-10-17 15:09:22 | Verify->verifyBlock failed for block 10273493690874969091 at height 7301593. - ["Invalid block reward: 400000000 expected: 300000000"]
[ERR] 2018-10-17 15:09:22 | Loader->validateBlock Validating block failed for 10273493690874969091 at height 7301593. - ["Invalid block reward: 400000000 expected: 300000000"]
[inf] 2018-10-17 15:09:22 | Validating last block of second last round with height 7301391
[inf] 2018-10-17 15:09:23 | Releasing enqueued broadcasts
[inf] 2018-10-17 15:09:23 | Queue empty
[inf] 2018-10-17 15:09:23 | Loader->validateBlock Validating block 12822964154838819782 at height 7301391
[ERR] 2018-10-17 15:09:25 | Verify->verifyBlock failed for block 12822964154838819782 at height 7301391. - ["Invalid block reward: 400000000 expected: 300000000"]
[ERR] 2018-10-17 15:09:25 | Loader->validateBlock Validating block failed for 12822964154838819782 at height 7301391. - ["Invalid block reward: 400000000 expected: 300000000"]
[ERR] 2018-10-17 15:09:25 | There are more than 202 invalid blocks. Can't delete those to recover the chain.
[FTL] 2018-10-17 15:09:25 | Domain master - {"message":"Your block chain is invalid. Please rebuild from snapshot.","stack":"Error: Your block chain is invalid. Please rebuild from snapshot.\n    at Immediate.__private.validateBlock.validateBlockErr (/Users/mq/Documents/GitHub/lisk-rrr/modules/loader.js:688:8)\n    at runCallback (timers.js:674:20)\n    at tryOnImmediate (timers.js:645:5)\n    at processImmediate [as _immediateCallback] (timers.js:617:5)"}
[FTL] 2018-10-17 15:09:25 | Error: Your block chain is invalid. Please rebuild from snapshot.
[inf] 2018-10-17 15:09:25 | Cleaning up...
[inf] 2018-10-17 15:09:25 | Cleaned up successfully

Steps to reproduce

Load mainnet snapshot into the database, start the node.

Which version(s) does this affect? (Environment, OS, etc...)

development branch

[4miners]

The reason for this is here:
https://github.com/LiskHQ/lisk/blob/c7ca88aae4cec0297b419bdf3bc72321af7bfc8e/config/mainnet/constants.js#L18-L20
Should be:

	REWARDS: {
		OFFSET: 1451520,
	},