Fix indent with get/set and line-separated variable assignment

[yukukotani]

Fixes #550

Fix indent before get/set in case of variable assignment is in separated line, to follow IDEA's formatting.

Current

object TestObject {
    var value: String =
        "tooooooooooooooooo looooooooooooooooooooooooooong line"
        // Unexpected indentation (8) (should be 12)
        private set
}

Patched

object TestObject {
    var value: String =
        "tooooooooooooooooo looooooooooooooooooooooooooong line"
        // No error
        private set
}

[Tapchicoma]

Thank you for fixing this issues.