Debugger: Ignore differences in 'const'-ness in type column

It's generally not too useful to see it at all, and in cases of
'const int' vs 'int const' it just defeats the test's purpose.

Change-Id: I3439dd8fcee28ffd1e599300a1c12f3215823573
Reviewed-by: hjk <hjk121@nokiamail.com>