message: Fix nested {  } constructions
diff: </dict>
  <key>name</key>
  <string>meta.group.braces.tex</string>
  - <!-- <key>patterns</key> -->
  - <!-- <array>
  + <key>patterns</key>
  + <array>
  <dict>
  <key>include</key>
  <string>#braces</string>
  </dict>
  - </array> -->
  + </array>
  </dict>
  </dict>
  <key>scopeName</key>
  