feat(spanner): fixed redundant class name typo

Author: sagnghos

google-cloud-spanner/src/main/java/com/google/cloud/spanner/connection/ConnectionOptions.java

@@ -1005,7 +1005,7 @@ static String determineHost(
       // The leading '//' is already included in the regex for the connection URL, so we don't need
       // to add the leading '//' to the host name here.
       host = matcher.group(Builder.HOST_GROUP);
-      if (ConnectionOptions.Builder.EXTERNAL_HOST_FORMAT.equals(matcher.pattern().pattern())
+      if (Builder.EXTERNAL_HOST_FORMAT.equals(matcher.pattern().pattern())
           && !host.matches(".*:\\d+$")) {
         host = String.format("%s:15000", host);
       }