Use case insensitive grep for checking status

[nickchomey]

ddev spx toggle and status aren't working for me as when I just run php -m I see SPX rather than spx.

ddev-spx/commands/web/spx

Lines 24 to 25 in 636ed59

	status=$(php -m | grep 'spx')
	if [ "${status}" = "spx" ]; then

This should probably be

  status=$(php -m | grep -i 'spx')
  if [ ! -z "${status}" ]; then

It should work for both upper and lowercase

Same should be done for both status and toggle