Removed unused leash help file

The file 'checkbox blank.png' is unneeded and contains a space in the
name, unnecessarily interfering with running find | xargs over the
source tree.  Remove it.

(cherry picked from commit 757860b48bcef42a9a5fddba984607edeb6e205c)

ticket: 7352
status: resolved

diff --git a/src/windows/leash/htmlhelp/Images/checkbox blank.png b/src/windows/leash/htmlhelp/Images/checkbox blank.png
deleted file mode 100644 (file)
index 03bc2b6..0000000
Binary files a/src/windows/leash/htmlhelp/Images/checkbox blank.png and /dev/null differ