Add previewFileMimeTypes to defaultconfig.go (#4414)

* Add previewFileMimeTypes to defaultconfig.go

* Add changelog item

* Format

* Remove obsolete hideSearchBar config setting

changelog/unreleased/enhancement-add-preview-file-mime-types-to-web-default-config

@@ -0,0 +1,6 @@
+Enhancement: Add previewFileMimeTypes to web default config
+
+We've added previewFileMimeTypes to the web default config, so web can determine which preview types are supported
+by the backend.
+
+https://github.com/owncloud/ocis/pull/4414

services/web/pkg/config/defaults/defaultconfig.go

@@ -49,7 +49,7 @@ func DefaultConfig() *config.Config {
 				},
 				Apps: []string{"files", "search", "preview", "text-editor", "pdf-viewer", "external", "user-management"},
 				Options: map[string]interface{}{
-					"hideSearchBar": false,
+					"previewFileMimeTypes": []string{"image/gif", "image/png", "image/jpeg", "text/plain"},
 				},
 			},
 		},