Partial fixes for #271

[AnmAtAnm]

• Fix BlocklyMask during manual mode.
• Fixed the layout of the manual mode block definition .</li> </ul> <!-- Reviewable:start --> <hr /> <p>This change is <a rel="noreferrer nofollow" target="_blank" href="https://reviewable.io/reviews/google/blockly-devtools/273"><img referrerpolicy="no-referrer" src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/></a></p> <!-- Reviewable:end --> </div> </div> <div class="page-bar-simple"> </div> <div class="footer"> <ul class="body"> <li>© <script> document.write(new Date().getFullYear()) </script> Githubissues.</li> <li>Githubissues is a development platform for aggregating issues.</li> </ul> </div> <script src="https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.min.js"></script> <script src="/githubissues/assets/js.js"></script> <script src="/githubissues/assets/markdown.js"></script> <script src="https://cdn.jsdelivr.net/gh/highlightjs/cdn-release@11.4.0/build/highlight.min.js"></script> <script src="https://cdn.jsdelivr.net/gh/highlightjs/cdn-release@11.4.0/build/languages/go.min.js"></script> <script> hljs.highlightAll(); </script> </body> </html>