monitor: remove obsolete data-mac

We're no longer advertising the woefully outdated Git for MacOS
installer, therefore there is no need for that information to be patched
through.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

layouts/partials/monitor.html

@@ -10,7 +10,7 @@ <h4> Latest source Release </h4>
   <span class="release-date">
     ({{ .Site.Params.latest_release_date }})
   </span>
-  <span data-mac="{{ .Site.Params.macos_installer.version }}" data-win="{{ .Site.Params.windows_installer.installer_x64.version }}" id="installer-version"></span>
+  <span data-win="{{ .Site.Params.windows_installer.installer_x64.version }}" id="installer-version"></span>
 
   <a href="https://www.kernel.org/pub/software/scm/git/" class="button" id="download-link">Download Source Code</a>
 </div>