config: don't require .config.2 to save a sample

Samples should contain kconfig-parsable definitions, not script variables.
.config.2 contains bash arrays, which is definitely not kconfig-safe...

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

 This is NOT the official version of dialog.  This version has been

 significantly modified from the original.  It is for use by the Linux

 kernel configuration script.  Please do not bother Savio Lam with 

 questions about this program.