Revert "Setting up virtual display for R2025a"

This reverts commit cd977b7.

Author: Kkuntal990

.github/workflows/ci.yml

@@ -63,15 +63,6 @@ jobs:
           release: ${{ matrix.release }}
           products: Statistics_and_Machine_Learning_Toolbox Signal_Processing_Toolbox
           cache: true
-
-      - name: Setup virtual display for R2025a
-        if: matrix.release == 'R2025a'
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y xvfb
-          export DISPLAY=:99
-          Xvfb :99 -screen 0 1024x768x24 > /dev/null 2>&1 &
-          sleep 3
 
       # Runs a set of commands using the runner's shell
       - name: Run all tests