Package review fixes (rhbz#2241553)

- Add SourceLicense tag to distinguish between the license of the app
  itself and its crate deps
- Slightly change virtual provides for bundled aperture crate to better
  match other rust packages

snapshot.spec

@@ -7,6 +7,9 @@ Version:        45.0
 Release:        %autorelease
 Summary:        Take pictures and videos
 
+# snapshot itself is GPL-3.0-or-later
+SourceLicense:  GPL-3.0-or-later
+# ... and its crate dependencies are:
 # (MIT OR Apache-2.0) AND Unicode-DFS-2016
 # Apache-2.0 OR MIT
 # Apache-2.0 WITH LLVM-exception OR Apache-2.0 OR MIT
@@ -44,7 +47,7 @@ Requires:       gstreamer1-plugins-bad-free%{_isa}
 # For hicolor icon theme directories
 Requires:       hicolor-icon-theme
 
-Provides:       bundled(rust-aperture) = 0.3.1
+Provides:       bundled(crate(aperture)) = 0.3.1
 
 %description
 Take pictures and videos on your computer, tablet, or phone.