Update test262 known issues metadata
Update test262 known issues metadata

* A few RegExp issues have been resolved via ES6 RegExp syntax.

harold-b/duktape,jmptrader/duktape,jmptrader/duktape,markand/duktape,markand/duktape,harold-b/duktape,markand/duktape,jmptrader/duktape,jmptrader/duktape,harold-b/duktape,harold-b/duktape,jmptrader/duktape,harold-b/duktape,markand/duktape,markand/duktape,svaarala/duktape,svaarala/duktape,svaarala/duktape,jmptrader/duktape,markand/duktape,markand/duktape,svaarala/duktape,svaarala/duktape,jmptrader/duktape,jmptrader/duktape,markand/duktape,harold-b/duktape,jmptrader/duktape,harold-b/duktape,svaarala/duktape,harold-b/duktape,markand/duktape,jmptrader/duktape,harold-b/duktape,markand/duktape,svaarala/duktape,svaarala/duktape,harold-b/duktape,svaarala/duktape