Fix Alloy editor in Safari browser

Several features of Alloy Editor does not work as expected when using Safari.

Here are some broken features:

• the toolbar does not appear consistently when clicking on the {}+ button
• clicks on the Table, Horizontal line, ... buttons in the toolbar don't work
• selecting text does not make the formatting toolbar appear

These issues were reported with the following versions:

• 14.0 (15610.1.28.1.9, 15610)
• Version 14.0.1 (15610.2.11.51.10, 15610)
• Version 14.0.1 (16610.2.11.51.8)

Errors are reported in the browser console: