Run nightly tests on active branches

mbedtls-2.16 has been archived.
development_2.x has been renamed to mbedtls-2.18.

Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
Change-Id: I03256ae4b0cff38c2f5e454a7ee162c59f3d1e82
diff --git a/mbed-tls-nightly-tests.yaml b/mbed-tls-nightly-tests.yaml
index 782aff3..8b101b9 100644
--- a/mbed-tls-nightly-tests.yaml
+++ b/mbed-tls-nightly-tests.yaml
@@ -132,4 +132,4 @@
         properties-content: GIT_CREDENTIALS_ID=mbedtls-github-token
     triggers:
     - parameterized-timer:
-        cron: "H(0-29) 20 * * * %MBED_TLS_BRANCH=development \nH(0-29) 20 * * * %MBED_TLS_BRANCH=development_2.x \nH(0-29) 20 * * * %MBED_TLS_BRANCH=mbedtls-2.16"
+        cron: "H(0-29) 20 * * * %MBED_TLS_BRANCH=development \nH(0-29) 20 * * * %MBED_TLS_BRANCH=mbedtls-2.18"