message: Do not highlight % in begin/end of macrocode env
diff: </dict>
  <dict>
  <key>begin</key>
  - <string>^% (\\begin\{macrocode\})</string>
  + <string>^(%) (\\begin\{macrocode\})</string>
  <key>captures</key>
  <dict>
  - <key>0</key>
  + <key>1</key>
  + <dict>
  + <key>name</key>
  + <string>comment.line.percentage.doctex</string>
  + </dict>
  + <key>2</key>
  <dict>
  <key>name</key>
  <string>entity.name.tag.macrocode.doctex</string>
  </dict>
  </dict>
  <key>end</key>
  - <string>^% (\\end\{macrocode\})</string>
  + <string>^(%) (\\end\{macrocode\})</string>
  <key>patterns</key>
  <array>
  <dict>
  