Hot fix after some reload minimized composer should be lost body

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

core/lib/presentation/utils/html_transformer/dom/hide_draft_signature_transformer.dart

@@ -19,6 +19,8 @@ class HideDraftSignatureTransformer extends DomTransformer {
       final currentStyle = signature.attributes['style']?.trim();
       if (currentStyle == null) {
         signature.attributes['style'] = 'display: none;';
+      } else if (currentStyle.contains('display: block;') == true) {
+        signature.attributes['style'] = currentStyle.replaceFirst('display: block;', 'display: none;');
       } else if (currentStyle.endsWith(';')) {
         signature.attributes['style'] = '$currentStyle display: none;';
       } else {