[FIX] 'Load More' on history tab ignores date filter (RT-1843)

[Jira RT-1843](https://ripplelabs.atlassian.net/browse/RT-1843)
[Bountysource](https://www.bountysource.com/issues/2842670-clicking-load-more-in-history-does-not-respect-the-set-date-filters)

This fix does not assume `dateMin` and `dateMax` are set. A simpler solution is possible if we permit the assumption that `dateMin` and `dateMax` will always be set when `loadMore` is called, as shown in [this commit](https://github.com/Madsn/ripple-client/commit/39fccc83ba797197fcc8738666307832da41955d). If you prefer the other solution let me know, then you can close this PR and I will submit a new one using the other branch.