fix(examples): Fix gatsby themed-site build errors (#187)

examples/gatsby/themed-site/src-tauri/Cargo.toml

@@ -33,7 +33,7 @@ includedir = "0.5.0"
   features = [ "edge" ]
 
 [features]
-dev = [ "tauri/dev" ]
+dev-server = [ "tauri/dev-server" ]
 embedded-server = [ "tauri/embedded-server" ]
 
 [[bin]]