UI: Make lock/unlock icons slightly smaller
Makes them a bit more equal in size to the eye icon in the main window.
Showing
![UI/forms/images/locked_mask.png](https://gitcode.net/bukuiling0332/obs-studio/-/raw/14e41dc0c17e3ccbb348d6ff920ec991d0bb9f50/UI/forms/images/locked_mask.png)
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![UI/forms/images/locked_mask.png](https://gitcode.net/bukuiling0332/obs-studio/-/raw/14e41dc0c17e3ccbb348d6ff920ec991d0bb9f50/UI/forms/images/locked_mask.png)
![UI/forms/images/locked_mask.png](https://gitcode.net/bukuiling0332/obs-studio/-/raw/14e41dc0c17e3ccbb348d6ff920ec991d0bb9f50/UI/forms/images/locked_mask.png)
![UI/forms/images/unlocked_mask.png](https://gitcode.net/bukuiling0332/obs-studio/-/raw/14e41dc0c17e3ccbb348d6ff920ec991d0bb9f50/UI/forms/images/unlocked_mask.png)
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![UI/forms/images/unlocked_mask.png](https://gitcode.net/bukuiling0332/obs-studio/-/raw/14e41dc0c17e3ccbb348d6ff920ec991d0bb9f50/UI/forms/images/unlocked_mask.png)
![UI/forms/images/unlocked_mask.png](https://gitcode.net/bukuiling0332/obs-studio/-/raw/14e41dc0c17e3ccbb348d6ff920ec991d0bb9f50/UI/forms/images/unlocked_mask.png)
Makes them a bit more equal in size to the eye icon in the main window.
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