Fix syntax

Author: brianegan

.github/actions/app_validation/action.yml

@@ -14,17 +14,16 @@ runs:
       shell: bash
       run: |
         sudo apt-get update
-        sudo apt-get update
-          sudo apt-get install -y \
-            clang \
-            cmake \
-            ninja-build \
-            pkg-config \
-            libgtk-3-dev \
-            libayatana-appindicator3-dev \
-            libsoup2.4-dev \ 
-            libglu1-mesa \
-            xvfb
+        sudo apt-get install -y \
+          clang \
+          cmake \
+          ninja-build \
+          pkg-config \
+          libgtk-3-dev \
+          libayatana-appindicator3-dev \
+          libsoup2.4-dev \ 
+          libglu1-mesa \
+          xvfb
 
     - name: Get dependencies
       shell: bash