Add shortcut key to Reset search (CTRL + ALT + F)

[asfimport]

@rollno748 (Bug 66053): Hello,

Need a shortcut key to Reset the search. This will help us to Reset Search while debugging or enhancing the script.

Reducing the effort in using mouse clicks.

e.g, CTRL + ALT + F

Thanks,

OS: All

[asfimport]

@rollno748 (migrated from Bugzilla): Created the pull request for the change ::

https://github.com/apache/jmeter/pull/710