binman: Drop comment-out code in testUpdateFdtOutput()

This code is not needed so drop it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/binman/ftest.py b/tools/binman/ftest.py
index 481f0dd..7000de9 100644
--- a/tools/binman/ftest.py
+++ b/tools/binman/ftest.py
@@ -1668,8 +1668,6 @@
             # source file (e.g. test/075_fdt_update_all.dts) thus does not enter
             # binman as a file called u-boot.dtb. To fix this, copy the file
             # over to the expected place.
-            #tools.WriteFile(os.path.join(self._indir, 'u-boot.dtb'),
-                    #tools.ReadFile(tools.GetOutputFilename('source.dtb')))
             start = 0
             for fname in ['u-boot.dtb.out', 'spl/u-boot-spl.dtb.out',
                           'tpl/u-boot-tpl.dtb.out']: