Make Xcode targets more specific

This makes sure they show up in the scheme selection menu when included with other libraries in top level Xcode projects

.github/workflows/ios.yml

@@ -15,8 +15,8 @@ jobs:
       fail-fast: false
       matrix:
         platform:
-        - { name: iOS, target: Framework, sdk: iphoneos }
-        - { name: tvOS, target: Framework, sdk: appletvos }
+        - { name: iOS, target: SDL3.framework, sdk: iphoneos }
+        - { name: tvOS, target: SDL3.framework, sdk: appletvos }
 
     steps:
       - uses: actions/checkout@v3