Set title of Resize/Move dialog for an extended partition (#44)

The title has never been set in this case, and defaulted to the name of
the executable 'gpartedbin'.  Fix this.

Closes #44 - Title not set in Resize/Move dialog for extended partitions
4 jobs for master in 18 minutes and 49 seconds (queued for 2 seconds)
Status Job ID Name Coverage
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passed #245460
centos_build

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passed #245461
ubuntu_build

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  Test
passed #245462
centos_test

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passed #245463
ubuntu_test

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