Delete syncedSettings for deleted libraries on sync error
Delete syncedSettings for deleted libraries on sync error

Not sure how this is possible, but fix it for now. It'll be prevented with a FK
check in 5.0.

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