Allow left pane collapsed state to persist
Allow left pane collapsed state to persist

Also fix weirdness trying to open collapsed tag selector after restart.
(The splitter's 'state' attribute has to be persisted, not the
'collapsed' state of the pane in question.)

LinuxMercedes/zotero,egh/zotero,adunning/zotero,egh/zotero,rmzelle/zotero,robamler/zotero,sendecomp/zotero,retorquere/zotero,robamler/zotero,gracile-fr/zotero,gracile-fr/zotero,retorquere/zotero,LinuxMercedes/zotero,sendecomp/zotero,rmzelle/zotero,adunning/zotero,adunning/zotero,rmzelle/zotero,hoehnp/zotero,robamler/zotero,hoehnp/zotero,retorquere/zotero,LinuxMercedes/zotero,sendecomp/zotero,egh/zotero,hoehnp/zotero,gracile-fr/zotero,aurimasv/zotero