caliper config header logic fix

[cyrush]

ascent_config.h.in:

#cmakedefine ASCENT_CALIPER_ENABLED   "@ASCENT_CALIPER_ENABLED@"

Should be:

#cmakedefine ASCENT_CALIPER_ENABLED   "@CALIPER_FOUND@"

[cyrush]

@nicolemarsaglia related to the issue you saw in your caliper work, this is how we should fix the define.

[nicolemarsaglia]

Ah that makes sense! Thank you for double checking!