[build] CMake: pass -sFULL_ES3 instead of -sFULL_ES3=1 (#4090)

* Allow ES3 in LibraryConfigurations.cmake

* Put FULL_ES3 as linker option

* Remove =1

src/CMakeLists.txt

@@ -71,7 +71,7 @@ endif()
 if (${PLATFORM} MATCHES "Web")
     target_link_options(raylib PUBLIC "-sUSE_GLFW=3")
     if(${GRAPHICS} MATCHES "GRAPHICS_API_OPENGL_ES3")
-        target_link_options(raylib PUBLIC "-sFULL_ES3=1")
+        target_link_options(raylib PUBLIC "-sFULL_ES3")
     endif()
 endif()