Update path in run_demos.py

This commit updates the path to programs in run_demos.py to
tf-psa-crypto/programs.

Signed-off-by: Harry Ramsey <harry.ramsey@arm.com>
diff --git a/tests/scripts/run_demos.py b/tests/scripts/run_demos.py
index 6a63d23..75febcd 100755
--- a/tests/scripts/run_demos.py
+++ b/tests/scripts/run_demos.py
@@ -44,7 +44,7 @@
 
     Return True if all demos passed and False if a demo fails.
     """
-    all_demos = glob.glob('programs/*/*_demo.sh')
+    all_demos = glob.glob('tf-psa-crypto/programs/*/*_demo.sh')
     if not all_demos:
         # Keep the message on one line. pylint: disable=line-too-long
         raise Exception('No demos found. run_demos needs to operate from the Mbed TLS toplevel directory.')