[BUGFIX] Add missing jQuery context for EM modal

This patch adds the modal context to be able to confirm the installation
of an incompatible extension.

Resolves: #79995
Releases: master
Change-Id: I84187076684eb1fb4ee69679f8003ec115a6bf2c
Reviewed-on: https://review.typo3.org/51826


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Jasmina Ließmann <code@frauliessmann.de>
Tested-by: Jasmina Ließmann <code@frauliessmann.de>
Reviewed-by: Helmut Hummel <typo3@helhum.io>
Tested-by: Helmut Hummel <typo3@helhum.io>