Adding [[ in place of [ to both xprotect_re-enable_adobe_flash.sh and xprotect_re-enable_java_6_and_7.sh

Ryan Manly opened a pull request for
xprotect_re-enable_java_6_and_7.sh, where he noted an error condition
if the JavaWebComponentVersionMinimum entry in XProtect.meta.plist was
deleted. To fix this, I'm adding [[ in place of [ to both
xprotect_re-enable_adobe_flash.sh and
xprotect_re-enable_java_6_and_7.sh.