fix err in script

attempting to fix command not found error in script:
https://github.com/fermyon/spin-rust-sdk/actions/runs/11710032376/job/32615376772#step:5:176

Signed-off-by: Michelle Dhanani <[email protected]>

Author: michelleN

scripts/build_examples.sh

@@ -21,9 +21,9 @@ for example in "$EXAMPLES_DIR"/*; do
     build_status=$?
 
     if [[ $build_status -eq 0 ]]; then
-      echo "✅ `$ spin build` succeeded for $example_name"
+      echo "✅ spin build succeeded for $example_name"
     else
-      echo "❌ `$ spin build` failed for $example_name"
+      echo "❌ spin build failed for $example_name"
     fi
     echo "$build_output"