adjusted z threshold for audio (ind) to match threshold for movie (ind)

code/2nd-lvl_audio-ppa-ind.fsf

@@ -179,7 +179,7 @@ set fmri(thresh) 3
 set fmri(prob_thresh) 0.05
 
 # Z threshold
-set fmri(z_thresh) 3.4
+set fmri(z_thresh) 2.3
 
 # Z min/max for colour rendering
 # 0 : Use actual Z min/max