ShellPkg: bug fix for edit search/replace function

* Fix the search bug: if word to be searched at the beginning of the line, it can not be found out.

Signed-off-by: kidzyoung
reviewed-by: jcarsey

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12116 6f19259b-4bc3-4df7-8a09-765794883524
1 file changed