hotline#127434 : Update .htaccess to add xlsm extension

.htaccess

@@ -3,7 +3,7 @@ RewriteEngine on
 RewriteCond %{REQUEST_URI} !^/(google[a-z0-9]+\.html|.*/xhprof_html|ckeditor|exploit|\.well-known)
 RewriteCond %{REQUEST_FILENAME} !^.*/robots\.txt$ [NC]
 
-RewriteRule !(userfiles|public|tmp|temp|skins|library/templates|library/digital_resources/.*/js)/.*\.(js|ico|txt|gif|jpg|jpeg|png|css|xml|swf|mov|pdf|doc|docx|woff|woff2|eot|svg|ttf|xls|xlsx|wsdl|mp3|m4v|ogg|ogv|epub|htm|html|xhtml|asmx|zip|sql|bro|flv|mp4|webm|tgz|json|geojson|xsl|ods|odp|odt|ots|ott|odm|odg|otg|otp)$ index.php [NC,NE]
+RewriteRule !(userfiles|public|tmp|temp|skins|library/templates|library/digital_resources/.*/js)/.*\.(js|ico|txt|gif|jpg|jpeg|png|css|xml|swf|mov|pdf|doc|docx|woff|woff2|eot|svg|ttf|xls|xlsx|xlsm|wsdl|mp3|m4v|ogg|ogv|epub|htm|html|xhtml|asmx|zip|sql|bro|flv|mp4|webm|tgz|json|geojson|xsl|ods|odp|odt|ots|ott|odm|odg|otg|otp)$ index.php [NC,NE]
 
 AddType application/x-javascript .js
 AddType text/css .css