fix error message in `<<swim>>`

sugarcube/src/activities/swim/swim.ts

@@ -23,7 +23,7 @@ Macro.add('swim', {
 			jQuery(this.output).wiki(`<<mood 'swim' ${duration}>>`);
 		}
 		catch (ex) {
-			return this.error('ERROR in say-widget: ' + ex.message);
+			return this.error('ERROR in swim-widget: ' + ex.message);
 		}
 	}
 });