ci: halt Core git builds

.travis.yml

@@ -30,9 +30,8 @@ jobs:
     - stage: Test WebUI
     - stage: Test PlatformIO Build
       env: TEST_ENV=esp8266-4m-base
-    - env: TEST_ENV=esp8266-4m-latest-base
     - env: >-
-        TEST_ENV=esp8266-4m-git-base TEST_EXTRA_ARGS="-a
+        TEST_ENV=esp8266-4m-latest-base TEST_EXTRA_ARGS="-a
         test/build/extra/secure_client.h"
     - stage: Release
       env: BUILDER_THREAD=0