[html] Remove a testcase to check case-insensitivity of radio button …

[tkent-google]

…group name

The testcase doesn't match to the current specification, and
radio-groupname-case.html covers this feature.

[wpt-pr-bot]

Notifying @Ms2ger, @ayg, @gsnedders, @jdm, @jgraham, @sideshowbarker, @zcorpan, and @zqzhang. (Learn how reviewing works.)

[tkent-google]

@domenic @TakayoshiKochi , would you review this please?

[wpt-stability-bot]

Firefox

Testing revision 9181e70
Starting 10 test iterations
All results were stable

All results

/html/semantics/forms/the-input-element/radio.html

Subtest	Results
	OK
canceled activation steps on unchecked radio	PASS
only one control of a radio button group can have its checkedness set to true	PASS
changing the name of a radio input element and setting its checkedness to true makes all the other elements' checkedness in the same radio button group be set to false	PASS
click on mutable radio fires click event, then input event, then change event	PASS
click on non-mutable radio doesn't fire the change event	PASS
click on non-mutable radio doesn't fire the input event	PASS
radio inputs with non-ASCII name attributes belong to the same radio button group	PASS

[wpt-stability-bot]

Chrome

Testing revision 9181e70
Starting 10 test iterations
All results were stable

All results

/html/semantics/forms/the-input-element/radio.html

Subtest	Results
	OK
canceled activation steps on unchecked radio	PASS
only one control of a radio button group can have its checkedness set to true	PASS
changing the name of a radio input element and setting its checkedness to true makes all the other elements' checkedness in the same radio button group be set to false	PASS
click on mutable radio fires click event, then input event, then change event	FAIL
click on non-mutable radio doesn't fire the change event	PASS
click on non-mutable radio doesn't fire the input event	PASS
radio inputs with non-ASCII name attributes belong to the same radio button group	PASS

[zcorpan]

Can you change it so radio3 and radio4 both have the name groüp2?

radio-groupname-case.html doesn't test that two controls with the same name with non-ASCII characters are in the same group, as far as I can tell.

[tkent-google]

@zcorpan thank you for the comment. New commit addressed it.

[zcorpan]

Thanks!