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
issue