Update getJobProgression method in Log class to be moe efficient and clearer

app/Log.php

@@ -19,17 +19,13 @@ class Log extends Model
             return "Calculation in progress...";
         }
         if ($wowa->status == Wowa::STATE_COLLECTION) {
-            $result = 'Evidences collection : ';
             $log = self::where('job_id', '=', $wowa->id)
                 ->where('training', '=', false)->orderBy('progression', 'desc')->first();
-            return $result . $log->progression;
-        } elseif ($wowa->status == Wowa::STATE_RUNNING) {
-            $result = 'Training : ';
+            return $log->progression;
+        } elseif ($wowa->status == Wowa::STATE_RUNNING || $wowa->status == Wowa::STATE_SUCCESS) {
             $log = self::where('job_id', '=', $wowa->id)
                 ->where('training', '=', true)->orderBy('progression', 'desc')->first();
-            return $result . ((($logs->progression + 1) / $wowa->generation_number) * 100);
-        } elseif ($wowa->status = Wowa::STATE_SUCCESS) {
-            return (($logs->progression + 1) / $wowa->generation_number) * 100;
+            return ((($log->progression + 1) / $wowa->generation_number) * 100);
         } else {
             return 'Error';
         }