Multiple shortcodes cannot work on the same page

[Utsav-Ladani]

Multiple shortcodes cannot work on the same page

• rtmedia_gallery shortcode is not working correctly when adding it more than once.
• Reason behind this is the pagination is designed that way.
• Tried to fix this and was able to with backbone.js, but it works only for the Load More type pagination.
• 1,2,3...6 numerical pagination is based on the URL. All data is loaded using the URL /pg/2/.
• In this case, two different shortcodes with different pages will not work.
• So this PR adds restriction and prevents the shortcode from generating output if It is used more than once.

[kjnanda]

@Pradeep1308 Can you please share the visual of the issue and fix you added? This will help us to replicate and cross check.

CC @pavanpatil1