ConfigTest: Remove redundant assignment

Change-Id: Ia913dbe6b7ad4b7000525fda8ca08cbc8dd87da6
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/ConfigTest.java

@@ -837,8 +837,7 @@ public class ConfigTest {
 		File config = tmp.newFile("config");
 
 		String fooBar = "[foo]\nbar=true\n";
-		String fooPlus = fooBar;
+		Files.write(config.toPath(), fooBar.getBytes());
-		Files.write(config.toPath(), fooPlus.getBytes());
 
 		Config parsed = parse("[include]\npath=" + pathToString(config) + "\n");
 		assertFalse(parsed.getBoolean("foo", "bar", false));