Add PR-850-merge to the temporary exceptions

This is so we can test on a PR that has never been reviewed.

Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
Change-Id: Icedac2b4d8f860ac27dae03b812ba08d51df9b3d
diff --git a/mbed-tls-restricted-pr-ci-testing.yaml b/mbed-tls-restricted-pr-ci-testing.yaml
index d44daee..071bdfe 100644
--- a/mbed-tls-restricted-pr-ci-testing.yaml
+++ b/mbed-tls-restricted-pr-ci-testing.yaml
@@ -52,10 +52,10 @@
             defaults:
             - suppress-scm-triggering: true
             exceptions:
-              # Temporarily enable automatic scm triggering of PR-906-merge,
+              # Temporarily enable automatic scm triggering of PR-850-merge and PR-906-merge,
               # to test the BranchIndexingCause-specific branches modified by Mbed-TLS/mbedtls-test#71
             - exception:
-                branch-name: 'PR-906-merge'
+                branch-name: 'PR-850-merge,PR-906-merge'
                 properties:
                 - suppress-scm-triggering: false
         submodule: