Improve (unused) code

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/permalinks/DefaultPermalinkService.kt

@@ -43,10 +43,9 @@ internal class DefaultPermalinkService @Inject constructor(
     }
 
     override fun getLinkedId(url: String): String? {
-        val isSupported = url.startsWith(MATRIX_TO_URL_BASE)
-
-        return if (isSupported) {
-            url.substring(MATRIX_TO_URL_BASE.length)
-        } else null
+        return url
+                .takeIf { it.startsWith(MATRIX_TO_URL_BASE) }
+                ?.substring(MATRIX_TO_URL_BASE.length)
+                ?.substringBeforeLast("?")
     }
 }