TF-2520 Use mime type png to display logo in print page

Signed-off-by: dab246 <tdvu@linagora.com>

core/lib/presentation/resources/assets_paths.dart

@@ -1,4 +1,5 @@
 class AssetsPaths {
   static const images = 'assets/images/';
+  static const icons = 'assets/icons/';
   static const configurationImages = 'configurations/icons/';
 }

core/lib/presentation/resources/image_paths.dart

@@ -210,11 +210,16 @@ class ImagePaths {
   String get icUnsubscribe => _getImagePath('ic_unsubscribe.svg');
   String get icRecoverDeletedMessages => _getImagePath('ic_recover_deleted_messages.svg');
   String get icPrinter => _getImagePath('ic_printer.svg');
+  String get icLogoApp => _getIconPath('logo_app.png');
 
   String _getImagePath(String imageName) {
     return AssetsPaths.images + imageName;
   }
 
+  String _getIconPath(String iconName) {
+    return AssetsPaths.icons + iconName;
+  }
+
   String getConfigurationImagePath(String imageName) {
     return AssetsPaths.configurationImages + imageName;
   }