fix(setup): Fix typo for split variable assignment

docs/static/setup.sh

@@ -120,7 +120,7 @@ select opt in "${options[@]}" "Quit"; do
     18 ) shield_title="Tidbit" shield="tidbit"; split="n" break;;
     19 ) shield_title="Eek!" shield="eek"; split="n" break;;
     20 ) shield_title="BFO-9000" shield="bfo9000"; split="y"; break;;
-    21 ) shield_title="Helix" shield="helix"; split"y"; break;;
+    21 ) shield_title="Helix" shield="helix"; split="y"; break;;
 
     # Add link to docs on adding your own custom shield in your ZMK config!
     # $(( ${#options[@]}+1 )) ) echo "Other!"; break;;