[Cleanup] Redundant substring() operation in help.webapp

Removes the second substring() parameter if this parameter is the length
of the string. It's the default value.

Found during testing of Bug 569800 (new JDT cleanup for this case).

Change-Id: I5e4f5fb3fb20eea1b05a44bbd604483b032358cb
Signed-off-by: Lars Vogel <Lars.Vogel@vogella.com>
2 files changed