chore: don't default to installing system files in scripts (#2592)

.github/workflows/pr_test_build_linux.yml

@@ -209,7 +209,7 @@ jobs:
         run: |
           set -x -e
           pushd scripts
-            ./build_bitbox_flutter.sh --dont-install
+            ./build_bitbox_flutter.sh
           popd
 
       - name: Install Flutter dependencies
@@ -222,7 +222,7 @@ jobs:
           export MWEBD_HASH=$(cat scripts/android/build_mwebd.sh | grep 'git reset --hard' | xargs | awk '{ print $4 }')
           echo MWEBD_HASH=$MWEBD_HASH >> /etc/environment
           pushd scripts/android
-            ./build_mwebd.sh --dont-install
+            ./build_mwebd.sh
           popd
 
       - name: Build generated code