Glimpse: Don't hardcode external volume name

Change-Id: Ifc2c17080e2dbbf52f8195267829d036550acca4
diff --git a/app/src/main/java/org/lineageos/glimpse/query/MediaQuery.kt b/app/src/main/java/org/lineageos/glimpse/query/MediaQuery.kt
index 310ff25..e42c558 100644
--- a/app/src/main/java/org/lineageos/glimpse/query/MediaQuery.kt
+++ b/app/src/main/java/org/lineageos/glimpse/query/MediaQuery.kt
@@ -9,7 +9,7 @@
 import android.provider.MediaStore
 
 object MediaQuery {
-    val MediaStoreFileUri: Uri = MediaStore.Files.getContentUri("external")
+    val MediaStoreFileUri: Uri = MediaStore.Files.getContentUri(MediaStore.VOLUME_EXTERNAL)
     val MediaProjection = arrayOf(
         MediaStore.Files.FileColumns._ID,
         MediaStore.Files.FileColumns.BUCKET_ID,