[CALR-67] Shiny apps routes don't work systematically

[eblondel]

Issue migrated from JIRA: https://sdlc.review.fao.org/jira/browse/CALR-67
Creator/Reporter: Emmanuel Blondel @eblondel
Assignee: Brian Ojok @brianandy
Priority: Medium
Status: Done
Date of creation: 2022-03-30T09:33:08.000+0000

The page url's werenot changing as one moved from one page to another (from current to previous page) because the url passed at each session was static.
changed the approach by using reactive tab inputs at every session as the url of every current page