[webapi] Remove the support.js in tct-webstorage-w3c-tests

Impacted tests(approved):new 0,update 127,delete 0
Unit test platform:[Tizen IVI][Android]
Unit test result summary:pass 127,fail 0,block 0
Better split this assertion into 2: one is to check the typo using `assert_equals`, the other to check instance of using `assert_true`.

Please continue to improve other test cases, thanks.