Fix spelling of a disabled option

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 74c56d5..a99ebbc 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -1564,7 +1564,7 @@
   # System stuff
   scripts/config.py unset MBEDTLS_ERROR_C
   scripts/config.py unset MBEDTLS_TIMING_C
-  scripts/config.py unset MBEDTLS_VERSION_FEATURES_C
+  scripts/config.py unset MBEDTLS_VERSION_FEATURES
   # Crypto stuff with no PSA interface
   scripts/config.py unset MBEDTLS_BASE64_C
   scripts/config.py unset MBEDTLS_NIST_KW_C