perf hists browser gtk: Use hist_entry__has_callchains()

Since we can't go from struct hists to struct evsel for all cases (c2c
is an exception) and we have access to the hist_entry, use
hist_entry__has_callchains() in the GTK+ hists browser to figure out
if callchains are available.

Cc: Adrian Hunter <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Jin Yao <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Wang Nan <[email protected]>
Link: https://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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