Improve Partition Information mount Status formatting after port to GTK3
Previous to the port to GTK3 the Partition Information dialog would display the mount status so that it aligned with the Status: line and was left-aligned.
After the port the GTK3 the Partition Information dialog shows the mount status as not aligned with the Status: line, and not left-aligned. Interestingly in the following screen shot there appears to be room to display the entire "Mounted on /mnt/1" message on a single line, but this is not the case.
Ideally the display of the mount status should more closely match the old behaviour with GParted 0.33.0.