fix realpath in run_jest.sh

Although 'realpath' with no argument works on MacOS, it failed in the GH Actions workflow which runs on Ubuntu.
Use `.` for current directory

Author: JGreenlee

bin/run_jest.sh

@@ -4,7 +4,7 @@
 
 echo "Running JavaScript tests..."
 
-ROOT_DIR_ABSOLUTE=$(realpath)
+ROOT_DIR_ABSOLUTE=$(realpath .)
 
 # remove any existing test_js_* directories (from previous runs)
 rm -rf $ROOT_DIR_ABSOLUTE/test_js_*