Update G195 - removal of last line of test (low contrast OK if focus ring > 2px thick)

[detlevhfischer]

Deletion of last line of test procedure that indicated that contrast below 3:1 is OK if the focus ring is more than 2px thick

Closes #3682

[bruce-usab]

Discussed on TF call 11/8 and moved to Ready for approval after Patrick offered to double check.

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[mbgower]

@patrickhlauke and @detlevhfischer please see my comments #3682 . I believe we need to decide whether we are to maintain two versions of G195. Either way, we need more changes in the Test (unless we are intentionally exceeding the Non-text Contrast requirements). Also, if we decide not to apply this technique to 2.4.13 in 2.2, we need to make adjustments to the Understanding document to remove the mapping.

[mbgower]

@kfranqueiro I'm just bringing this one to your attention, as it may be relevant to your 2.1 update

[mbgower]

Discussed on the TF admin call.
I will do the following:

• rewrite the G195 test to be specific to meet Non-text Contrast (and focus visible)
• remove the reference to G195 in the Focus Apperance Understanding document
• investigate other techniques that attempt to meet both AA and AAA (e.g., G17 and G18)
• open a new issue to draft a new technique to meet Focus Appearance
• Consider the title and guidance in G195 and the new technique to ensure they are complementary but also distinctive

[alastc]

I agree with having two separate techniques:

• G195 is for WCAG 2.1, and we remove the focus-appearance aspects.
• G2xx for WCAG 2.2, which meets the focus-appearance one. Include a note at the top saying something like "This builds on G195 to cover Focus-Appearance".

This PR could be just for the first part, and separate the second one.