sample: Fix PROTO_FILE_PATH in SchemaBundleExample

Change-Id: I9699979a595d77f53e53f619a86b6d03b29512a5

Author: trollyxia

samples/snippets/src/main/java/com/example/bigtable/SchemaBundleExample.java

@@ -51,7 +51,7 @@
 public class SchemaBundleExample {
 
   private static final String COLUMN_FAMILY = "cf";
-  private static final String PROTO_FILE_PATH = "descriptors.pb";
+  private static final String PROTO_FILE_PATH = "com/example/bigtable/descriptors.pb";
   private final String tableId;
   private final String schemaBundleId;
   private final BigtableTableAdminClient adminClient;