[Multicolumn] Fix failing multicolumn TCT tests.

Tests are incompatible with the multicolumn
w3c spec: http://www.w3.org/TR/css3-multicol/

Most tests needed to use proper CSS property
names. Some tests try to set invalid
negative values.

Change-Id: I7d186dbed2e55a391c529ff81aeb16dff5b9db5e
Merge pull request #552 from tiwanek/XWALK-2202

[Multicolumn] Fix failing multicolumn TCT tests.