Test-case: Relax sigma-k parameter in check-alsabat.sh

The value 1.5 has caused a false failure possibly due to noise
in the test device output. Value 2.1 gives a small relaxation
and passes the previously failed capture.

Fixes 92fe8a1

Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>

Author: singalsu

test-case/check-alsabat.sh

@@ -40,7 +40,7 @@ OPT_NAME['F']='frequency'       OPT_DESC['F']='target frequency'
 OPT_HAS_ARG['F']=1             OPT_VAL['F']=821
 
 OPT_NAME['k']='sigmak'		OPT_DESC['k']='sigma k value'
-OPT_HAS_ARG['k']=1             OPT_VAL['k']=1.5
+OPT_HAS_ARG['k']=1             OPT_VAL['k']=2.1
 
 OPT_NAME['n']='frames'          OPT_DESC['n']='test frames'
 OPT_HAS_ARG['n']=1             OPT_VAL['n']=240000