Fix macOS builds, II.

- Switch to macOS .app export, instead of .dmg, to avoid: "Invalid
  export format." error in GitHub Actions.

export_presets.cfg

@@ -77,7 +77,7 @@ custom_features=""
 export_filter="all_resources"
 include_filter=""
 exclude_filter=""
-export_path="build/energy-shot.dmg"
+export_path="build/energy-shot.app"
 encryption_include_filters=""
 encryption_exclude_filters=""
 encrypt_pck=false
@@ -118,7 +118,7 @@ codesign/entitlements/custom_file=""
 codesign/entitlements/allow_jit_code_execution=false
 codesign/entitlements/allow_unsigned_executable_memory=false
 codesign/entitlements/allow_dyld_environment_variables=false
-codesign/entitlements/disable_library_validation=false
+codesign/entitlements/disable_library_validation=true
 codesign/entitlements/audio_input=false
 codesign/entitlements/camera=false
 codesign/entitlements/location=false