Remove duplicate call to get blobStoreType

src/test/java/org/gaul/s3proxy/S3ProxyTest.java

@@ -477,7 +477,6 @@ public final class S3ProxyTest {
     @Test
     public void testMaximumMultipartUpload() throws Exception {
         // skip with remote blobstores to avoid excessive run-times
-        String blobStoreType = context.unwrap().getProviderMetadata().getId();
         assumeTrue(blobStoreType.equals("filesystem") ||
                 blobStoreType.equals("transient"));