[shotwell] camera: Add mtp to supported mount schemes

[Jens Georg <jensgeorg src gnome org>]

commit 84652f97b55a84d93413ff02164561f8b3c70587
Author: Jens Georg <mail jensge org>
Date:   Thu Jun 28 22:03:56 2018 +0200

    camera: Add mtp to supported mount schemes
    
    This allows automatic unmounting of MTP devices.

 src/library/LibraryWindow.vala | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/library/LibraryWindow.vala b/src/library/LibraryWindow.vala
index 4c3baa8c..bf7399f8 100644
--- a/src/library/LibraryWindow.vala
+++ b/src/library/LibraryWindow.vala
@@ -20,7 +20,8 @@ public class LibraryWindow : AppWindow {
     private const string[] SUPPORTED_MOUNT_SCHEMES = {
         "gphoto2:",
         "disk:",
-        "file:"
+        "file:",
+        "mtp:"
     };
     
     private const int BACKGROUND_PROGRESS_PULSE_MSEC = 250;