Addressed build failures by initializing an array properly as '[]' instead of 'undefined,' (!185)

Co-authored-by: Mihai <mihai@something.com>
Reviewed-on: https://dev.sp-tarkov.com/SPT-AKI/Server/pulls/185
Co-authored-by: Mihai <mihai@noreply.dev.sp-tarkov.com>
Co-committed-by: Mihai <mihai@noreply.dev.sp-tarkov.com>

project/src/services/SeasonalEventService.ts

@@ -31,7 +31,7 @@ export class SeasonalEventService
     protected christmasEventActive: boolean = undefined;
 
     /** All events active at this point in time */
-    protected currentlyActiveEvents: SeasonalEventType[] = undefined;
+    protected currentlyActiveEvents: SeasonalEventType[] = [];
 
     constructor(
         @inject("WinstonLogger") protected logger: ILogger,