Fix incorrect manpage

The flashrom manpage currently says "-w, --write: Write file into flash
ROM (default when <file> is specified)". This is no longer true for recent
flashrom versions, which only write if you explicitly use the -w option.

Proof:

$ flashrom coreboot.rom
flashrom v0.9.0-r631
No coreboot table found.
Found chipset "Intel ICH7/ICH7R", enabling flash write... OK.
Found board "Kontron 986LCD-M", enabling flash write... OK.
Calibrating delay loop... OK.
Found chip "PMC Pm49FL004" (512 KB) at physical address 0xfff80000.
No operations were specified.

Thus, fix manpage accordingly.

Corresponding to flashrom svn r649.

Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>
diff --git a/flashrom.8 b/flashrom.8
index 70f505c..b64ae6d 100644
--- a/flashrom.8
+++ b/flashrom.8
@@ -33,9 +33,7 @@
 .BR <file> .
 .TP
 .B "\-w, \-\-write <file>"
-Write file into flash ROM (default when
-.B <file>
-is specified).
+Write file into flash ROM.
 .TP
 .B "\-n, \-\-noverify"
 Do