detect-environment: Put ;; on separate line

Put the pattern block terminators on separate lines, in the
detect_packaging function, for the sake of consistency.

Ticket: ENT-12600
Signed-off-by: Lars Erik Wik <lars.erik.wik@northern.tech>

Author: larsewi

build-scripts/detect-environment

@@ -254,9 +254,11 @@ detect_packaging()
 
   case "$OS" in
     aix)
-      PACKAGING=lpp;;
+      PACKAGING=lpp
+      ;;
     mingw)
-      PACKAGING=msi;;
+      PACKAGING=msi
+      ;;
     *)
       PACKAGING=$DEP_PACKAGING;;
   esac