Reduce some lines of code

Author: Isira-Seneviratne

app/src/main/java/org/schabi/newpipe/ui/components/video/VideoDescriptionSection.kt

@@ -160,12 +160,10 @@ fun VideoDescriptionSection(streamInfo: StreamInfo) {
                 }
             }
 
-            if (streamInfo.ageLimit != StreamExtractor.NO_AGE_LIMIT) {
+            val ageLimit = streamInfo.ageLimit
+            if (ageLimit != StreamExtractor.NO_AGE_LIMIT) {
                 item {
-                    MetadataItem(
-                        title = R.string.metadata_age_limit,
-                        value = streamInfo.ageLimit.toString()
-                    )
+                    MetadataItem(title = R.string.metadata_age_limit, value = ageLimit.toString())
                 }
             }