Header: Makes the "Modify game button" disabled by default

Reported-by: bnurbekov, mamora
Signed-off-by: Batyrlan Nurbekov <bnurbekov@wpi.edu>, Miguel Mora
<mamora@wpi.edu>
Merge pull request #103 from bnurbekov/sbl-dev

Header: Makes the "Modify game button" disabled by default