Revert "Disable scintilla assert in order to enter commit message in debug mode"

This reverts commit a60359019362384b2b78a2b8b8325695f9c0bc01.

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Define NDEBUG in ScintillaLexer.vcxproj

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>