Fix failing unit test by closing DB consistently in db.delete().

Added the option to allow a delete for the purpose of recreation: db.delete({disableAutoOpen: false}).
We did something between before but need to be consistent here.

src/classes/dexie/dexie.ts

@@ -349,12 +349,12 @@ export class Dexie implements IDexie {
     }
   }
 
-  delete(): Promise<void> {
+  delete(closeOptions = {disableAutoOpen: true}): Promise<void> {
     const hasArguments = arguments.length > 0;
     const state = this._state;
     return new Promise((resolve, reject) => {
       const doDelete = () => {
-        this.close({disableAutoOpen: false});
+        this.close(closeOptions);
         var req = this._deps.indexedDB.deleteDatabase(this.name);
         req.onsuccess = wrap(() => {
           _onDatabaseDeleted(this._deps, this.name);

src/public/types/dexie.d.ts

@@ -97,7 +97,7 @@ export interface Dexie {
 
   close(closeOptions?: {disableAutoOpen: boolean}): void;
 
-  delete(): PromiseExtended<void>;
+  delete(closeOptions?: {disableAutoOpen: boolean}): PromiseExtended<void>;
 
   isOpen(): boolean;