js: resolve the mysterious "extra" unhandled exception notification, caused by inadvertently forking one promise into two separate ones (failing to properly reassign a then() result). Fix a typo in new Worker 1 code which caused the DB(filename) name to be incorrect.

FossilOrigin-Name: 7467ac88801224089b51c6ba7924f93283dd87beca602a186c83632df26cfc85

ext/wasm/api/sqlite3-api-prologue.js

@@ -173,7 +173,7 @@ self.sqlite3ApiBootstrap = function sqlite3ApiBootstrap(
       config[k] = config[k]();
     }
   });
-  
+
   /** Throws a new Error, the message of which is the concatenation
       all args with a space between each. */
   const toss = (...args)=>{throw new Error(args.join(' '))};