Flip condition to unindent pretty much all the code

No semantic changes.

docker/4_run/install_scripts.sh

@@ -1,5 +1,8 @@
 
-if [ ! -f /installed ]; then
+if [ -f /installed ]; then
+    return
+fi
+
 SITEPKG=$(echo /opt/python/lib/python3.*/site-packages)
 echo "Installing Blender Cloud packages into $SITEPKG"
 
@@ -15,4 +18,3 @@ if [ ! -f /installed ]; then
 echo "All packages installed."
 
 touch /installed
-fi