Remove obsolete detail in README

Now that scrcpy-server.jar is found in the same directory as the
scrcpy executable, using SCRCPY_SERVER_PATH is not particularly useful
on Windows anymore

README.md

@@ -331,8 +331,8 @@ To use a specific _adb_ binary, configure its path in the environment variable
 
     ADB=/path/to/adb scrcpy
 
-To override the path of the `scrcpy-server.jar` file (it can be [useful] on
-Windows), configure its path in `SCRCPY_SERVER_PATH`.
+To override the path of the `scrcpy-server.jar` file, configure its path in
+`SCRCPY_SERVER_PATH`.
 
 [useful]: https://github.com/Genymobile/scrcpy/issues/278#issuecomment-429330345