modified detection

• 199868redhat_unpatched_thunderbird-rhel5.nasl • 1.2
• 199882redhat_unpatched_thunderbird-rhel6.nasl • 1.2
• 199822redhat_unpatched_thunderbird-rhel7.nasl • 1.2
• 199930redhat_unpatched_thunderbird-rhel8.nasl • 1.2
• 200017redhat_unpatched_firefox-rhel4.nasl • 1.2
• 200040redhat_unpatched_firefox-rhel5.nasl • 1.2
• 200049redhat_unpatched_firefox-rhel6.nasl • 1.5
• 200050redhat_unpatched_firefox-rhel7.nasl • 1.2
• 202318redhat_unpatched_firefox-rhel8_module.nasl • 1.2
• 199961redhat_unpatched_firefox-rhel8.nasl • 1.3
• 202309redhat_unpatched_firefox-rhel9_module.nasl • 1.2
• 199960redhat_unpatched_firefox-rhel9.nasl • 1.3