add support for https source for popups

previously fullscreen.php tried to load any javascript files that were
running in the popup's parent.
If the source of the script didn't start with "http:" it was assumed
that it must be a relative path. This caused problems when it tried to
make it into an absolute path.
Fixed Regex to include support for https
Credit: Peter Bulmer <peterb@catalyst.net.nz>

lib/editor/htmlarea/popups/fullscreen.php

@@ -30,7 +30,7 @@
     // document.write("<scr" + "ipt type=" + "\"script/javascript\"");
     // document.write(" src=\"../" + script.src + "\"></scr" + "ipt>");
     var new_script = document.createElement("script");
-    if (/^http:/i.test(script.src)) {
+    if (/^https?:/i.test(script.src)) {
       new_script.src = script.src;
     } else {
       new_script.src = "../" + script.src;