Add setting for showing scene scrubber by default (#2325)

graphql/documents/data/config.graphql

@@ -51,6 +51,7 @@ fragment ConfigInterfaceData on ConfigInterfaceResult {
   soundOnPreview
   wallShowTitle
   wallPlayback
+  showScrubber
   maximumLoopDuration
   noBrowser
   notificationsEnabled

graphql/schema/types/config.graphql

@@ -207,6 +207,9 @@ input ConfigInterfaceInput {
   wallShowTitle: Boolean
   """Wall playback type"""
   wallPlayback: String
+
+  """Show scene scrubber by default"""
+  showScrubber: Boolean
   
   """Maximum duration (in seconds) in which a scene video will loop in the scene player"""
   maximumLoopDuration: Int
@@ -261,6 +264,9 @@ type ConfigInterfaceResult {
   """Wall playback type"""
   wallPlayback: String
 
+  """Show scene scrubber by default"""
+  showScrubber: Boolean
+
   """Maximum duration (in seconds) in which a scene video will loop in the scene player"""
   maximumLoopDuration: Int
   """True if we should not auto-open a browser window on startup"""