Rollup node: use stored history mode when not specified
Context
When it is not the default, one would have to always specify --history-mode full
on the command line. This MR makes it so that when history mode is not specified (neither in the CLI or the config), the rollup node runs in the history mode that it was previously run with (or the default history mode, archive, if it was never intialized).
Edited by Alain Mebsout