Fixed typo in run_tests.sh file

Change-Id: I1fc49a0213424bc0e16faf947e143570bfc2f916
diff --git a/tests/run_tests.sh b/tests/run_tests.sh
index 3f42101..9451611 100755
--- a/tests/run_tests.sh
+++ b/tests/run_tests.sh
@@ -110,7 +110,7 @@
 }
 
 salt_run() {
-    [ -e ${VEN_DIR}/bin/activate ] && source ${VENV_DIR}/bin/activate
+    [ -e ${VENV_DIR}/bin/activate ] && source ${VENV_DIR}/bin/activate
     salt-call ${SALT_OPTS} $*
 }