JBIDE-13491 org.jboss.tools.jst.css.test.jbide.InputFractionalValueTest_JBIDE4790 test failure for Eclipse 4.3.0.M5

issue is fully fixed in Alpha5 target platform
I make test back to normal(it was "negative").

Also I uncomment the part of test which was commented due to JBIDE-4790(I mark this issue in jira as resolved)