Ignore case of script tags to make sure they're removed. Fixes #5668.…

… Thanks to Motty/Fudgey for the report and Jitter for the patch!

src/ajax.js

@@ -1,5 +1,5 @@
 var jsc = now(),
-	rscript = /<script(.|\s)*?\/script>/g,
+	rscript = /<script(.|\s)*?\/script>/gi,
 	rselectTextarea = /select|textarea/i,
 	rinput = /color|date|datetime|email|hidden|month|number|password|range|search|tel|text|time|url|week/i,
 	jsre = /=\?(&|$)/,