Export data should be LTR

The textareas displayed on the bulk export page are set to RTL in RTL interfaces, which make the internal code unreadable. As a rule, all text areas containing code should be always LTR.

This patch fixes this by setting the "dir=ltr" on those textareas. The patch is an "svn diff" on my local repository, taken from the views/views_export directory (to apply cd to that dir, and "patch -p0"). Patch works on views 2.6 and 3.x dev from the downloads (both with 22 lines offset).