Fix MAL search results not showing start dates (#1098)

The previous approach would always throw an Exception because
`SimpleDateFormat.format()` expects the input to be of type `Date` or
`Number`, not `String`.

(cherry picked from commit 97c81fadb426d71ac99c9443ab0e89f4089046ef)

app/src/main/java/eu/kanade/tachiyomi/data/track/myanimelist/MyAnimeListApi.kt

@@ -129,12 +129,7 @@ class MyAnimeListApi(
                                 obj["status"]!!.jsonPrimitive.content.replace("_", " ")
                             publishing_type =
                                 obj["media_type"]!!.jsonPrimitive.content.replace("_", " ")
-                            start_date = try {
-                                val outputDf = SimpleDateFormat("yyyy-MM-dd", Locale.US)
-                                outputDf.format(obj["start_date"]!!)
-                            } catch (e: Exception) {
-                                ""
-                            }
+                            start_date = obj["start_date"]?.jsonPrimitive?.content ?: ""
                         }
                     }
             }