Fix arithmetic expression crash in project-install.sh

Script crashed with `set -e` due to post-increment returning exit code 1
when chain_depth was 0. Changed to pre-increment so expression always
returns non-zero value.

Author: Perlover

scripts/project-install.sh

@@ -447,7 +447,7 @@ main() {
             done
             chain_display="$chain_display"$'\n'"$indent  ↳ inherits from: $profile_name"
         fi
-        ((chain_depth++))
+        ((++chain_depth))
     done <<< "$reversed_chain"
     echo "$chain_display"