Fix expectaions in MojDecimal related tests

:Release Notes:
Made MojDecimalTest (test_core) and MojDecimalTest.original
(gtest_mojocore) to faile due to absence of rounding and proper
handling of exponent.

:Detailed Notes:
Originally MojDecimal related tests expected:
- no rounding during parsing
- only 6 decimals after dot is used even if there is a positive
  exponent aligning them to magnitude part of MojDecimal

:Testing Performed:
Unit-tests:
- test_core
- gtest_mojocore

:QA Notes:

:Issues Addressed:
[GF-36958] MojDecimal in DB8 have issues with rounding and exponent

Open-webOS-DCO-1.0-Signed-off-by: Nikolay Orliuk <nikolay.orliuk@lge.com>

Change-Id: I18232177641d76fe55264ce6382785bef2143d5c
Reviewed-on: https://g2g.palm.com/3330
Reviewed-by: Nikolay Orliuk <nikolay.orliuk@lge.com>
Tested-by: Nikolay Orliuk <nikolay.orliuk@lge.com>
Reviewed-by: Build Verification
Reviewed-by: Roger Stringer <roger.stringer@lge.com>