lh-rlh-on-root-001.html : 3 corrections to make

[TalbotG]

@frivoal

The 3 corrections to make are emboldened.

line 48 is:
assert_approx_equals( f_s, initial_f_s, 1, "the lh unit on the root element's font-size property uses font metrics corresponding to the initial values of the font or line-height properties");

line 48 should be instead:
assert_approx_equals( f_s, initial_l_h, 1, "the lh unit on the root element's font-size property uses font metrics corresponding to the initial values of the font or line-height properties");

---

line 54 is:
assert_approx_equals( f_s, initial_f_s, 1, "the rlh unit on the root element's font-size property uses font metrics corresponding to the initial values of the font or line-height properties");

line 54 should be instead:
assert_approx_equals( f_s, initial_l_h, 1, "the rlh unit on the root element's font-size property uses font metrics corresponding to the initial values of the font or line-height properties");

---

line 74 is:
assert_approx_equals( f_s, initial_f_s * 2, 1, "the lh unit on the root element's font-size property actually works as a unit and doesn't merely cause a fallback that doesn't take the number of units into account");

lin 74 should be instead:
assert_approx_equals( f_s, initial_l_h * 2, 1, "the lh unit on the root element's font-size property actually works as a unit and doesn't merely cause a fallback that doesn't take the number of units into account");

[TalbotG]

#15030

[frivoal]

Fixed by #15030