Fix casting to float in one more place

Author: nickygerritsen

webapp/src/Controller/API/JudgehostController.php

@@ -644,8 +644,8 @@ public function addJudgingRunAction(
         }
 
         $runResult    = $request->request->get('runresult');
-        $startTime    = $request->request->get('start_time');
-        $endTime      = $request->request->get('end_time');
+        $startTime    = (float)$request->request->get('start_time');
+        $endTime      = (float)$request->request->get('end_time');
         $runTime      = $request->request->get('runtime');
         $outputRun    = $request->request->get('output_run');
         $outputDiff   = $request->request->get('output_diff');