perf hists browser: Make ESC unzoom as well

perf hists browser: Make ESC unzoom as well

In addition to <-, that may be repurposed for horizontal scrolling.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-w3rctelxr4yxrjufx7z3fclb@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>