Submissions/ystskm: Add meta tags to baseline-horiz tests (2 to 4) 

Add meta tags to 3 tests and slight fix to 1ref.
- contributors/ttwf_tokyo/ystskm/submitted/flexbox-align-self-baseline-horiz-2.xhtml
- contributors/ttwf_tokyo/ystskm/submitted/flexbox-align-self-baseline-horiz-3.xhtml
- contributors/ttwf_tokyo/ystskm/submitted/flexbox-align-self-baseline-horiz-4.xhtml
and
- contributors/ttwf_tokyo/ystskm/submitted/reference/flexbox-align-self-baseline-horiz-4-ref.xhtml