[Merge] lp:~doflah/dialer-app/show_duration_hours into lp:dialer-app

[Bill Filler]

The proposal to merge lp:~doflah/dialer-app/show_duration_hours into lp:dialer-app has been updated.

Commit Message changed to:

Show hours in the call duration - fixes #1372689

For more details, see:
https://code.launchpad.net/~doflah/dialer-app/show_duration_hours/+merge/235552
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