Fix syntax error in install.sh (if closed with } instead of fi)

[malcolndandaro]

Summary

• Fixes a syntax error on line 862 of install.sh that breaks the curl-based installer:

  bash <(curl -sL https://raw.githubusercontent.com/databricks-solutions/ai-dev-kit/main/install.sh)
  /dev/fd/11: line 862: syntax error near unexpected token `}'
  

• The bug was introduced in commit 31f18dd (PR Fix silent and global install failures #169) which expanded a one-liner [ "$SCOPE" = "project" ] && { ... } into a multi-line if/then block but closed it with } instead of fi.

Fix

-    if [ "$SCOPE" = "project" ]; then 
+    if [ "$SCOPE" = "project" ]; then
         mkdir -p ".ai-dev-kit"
         echo "$ver" > ".ai-dev-kit/version"
-    }
+    fi

Test plan

• Run bash -n install.sh — should pass with no syntax errors
• Run bash <(curl -sL <raw-url>/install.sh) — installer should complete without syntax error

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