Remove unused `esc` listener
The problem is that additional listener (that was removed with this commit) overrides existing esc listeners of content. Additional listener for esc is redundant because it's never get called. `com.intellij.ui.popup.AbstractPopup#dispatchKeyEvent` prevents listeners execution if it returns true. So, if `myCancelKeyEnabled` is `false`, listener is not executed because of `if` condition and in case of `true` listeners are not executed. As long as this additional listener doesn't override existing listeners, `hide()` function is called with `myEscListener`. Review: IDEA-CR-45219 (cherry picked from commit f175fc8a)
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