Allow mixing of namedview and guide lock behavior
#### Steps to reproduce: - Create new document - Add 2 guides (orientation irrelevant) - Lock one guide - Lock all guides - Unlock all guides #### What happened? - Both guides are now unlocked #### What should have happened? - Unlock only the guides locked through use of the 'lock all' button #### Inkscape Version and Operating System: - Inkscape Version: Inkscape 0.92.5 (inkscape@2060ec1f9fd5932b79bda30956392bf30adbaf23, 2020-04-08) - Operating System: Windows 10 Pro - Operating System version: 1903 18362.720
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