Fix syntax error in last line

Signed-off-by: Kurt Garloff <kurt@garloff.de>

Author: garloff

cluster-settings-template.env

@@ -30,5 +30,5 @@ CL_CTRLNODES=1
 # Number of (initial) worker nodes
 CL_WRKRNODES=1
 ### Autofill magic, don't touch
-CS_MAINVER=${CS_MAINVER:-${CL_PATCHVER%.*})
+CS_MAINVER=${CS_MAINVER:-${CL_PATCHVER%.*}}