[Preset] Disable test installable package in OS X again

Author: shahmishal

utils/build-presets.ini

@@ -559,7 +559,7 @@ install-prefix=%(install_toolchain_dir)s/usr
 
 # Executes the lit tests for the installable package that is created
 # Assumes the swift-package-tests repo is checked out
-test-installable-package=0
+# test-installable-package=0
 
 # If someone uses this for incremental builds, force reconfiguration.
 reconfigure