Remove label info for single file system

[joseivanlopez]

Problem

The input File system type in the dialog for adding/editing a file system shows an info icon. That icon is used to give some info about the possible file system types that can be selected. The info icon should not be shown if there is only a single option, in which the file system type is rendered as plain text instead of a selector. See #926.

Solution

Remove info icon when there is only one option.

NOTE: there is some problems associated to the info icon. For example, it takes the focus while navigating through the form. Moreover, it opens a popover, which could be a bit strange when it is used in a popup. Probably this info icon will be replaced by another approach.

Testing

• Tested manually

Screenshots

[coveralls]

coverage: 74.724%. remained the same
when pulling 56bf57b on joseivanlopez:fix-fs-info
into 275c770 on openSUSE:master.