Disable javascript minifying of TinyMCE, ref magento/magento2#39253

Author: fballiano

app/code/Magento/Store/etc/config.xml

@@ -22,6 +22,7 @@
                 <minify_files>0</minify_files>
                 <minify_exclude>
                     <tiny_mce>/tiny_mce/</tiny_mce>
+                    <tiny_mce_6>/tiny_mce_6/</tiny_mce>
                 </minify_exclude>
             </js>
             <css>