fix CLI flag for base64 decoding

Author: baileympearson

.evergreen/run-kerberos-tests.sh

@@ -16,7 +16,7 @@ set +o verbose
 if [[ "$OSTYPE" == "darwin"* ]]; then
     echo ${KEYTAB_BASE64_AES} | base64 -D >"$(pwd)/.evergreen/drivers.keytab"
 else
-    echo ${KEYTAB_BASE64_AES} | base64 -D >"$(pwd)/.evergreen/drivers.keytab"
+    echo ${KEYTAB_BASE64_AES} | base64 -d >"$(pwd)/.evergreen/drivers.keytab"
 fi
 echo "Running kdestroy"
 kdestroy -A