Fix custom quick filter preselect validation

[OothecaPickle]

No description provided.

[theotherp]

Thanks for the MR. Are you sure this is correct? The format is filterName=value and with your change we would search the list of names for the value.

[OothecaPickle]

@theotherp Yes, I did a test build and it fixed the issue I was having (wherein a custom quickfilter I defined could not be preselected). Running this build, I was able to add custom quickfilters to preselect and they were automatically removed from preselect (as intended) when deleted.
Before this, defining a quickfilter, saving settings, adding a quickfilter to preselect, and saving settings again would result in the quickfilter being immediately removed from preselect, logged as "Custom quickfilter custom|filtername doesn't exist anymore, removing it from list of filters to preselect."

preselectQuickFilterButton is in the format "custom|[filtername]" and the line:
final String[] split = preselectQuickFilterButton.split("\\|");
splits it into "custom" (split[0]) and "[filtername]" (split[1]).

Therefore !customQuickfilterNames.contains(split[0])) checks customQuickfilterNames for the word "custom", not the actual name of the custom quickfilter (split[1]).

[theotherp]

Dang, should've tested this before I released a new version. Sorry, will be contained in the next one.

And congratulations on being the first contributor, I think, who makes a java change ;-)