Link GLFW as a shared library by default

Use one option name to control building GLFW as static/shared since it
is not straightforward to set it seperately for the samples and simulate

sample/cmake/SampleDependencies.cmake

@@ -58,8 +58,8 @@ findorfetch(
   EXCLUDE_FROM_ALL
 )
 
-option(MUJOCO_SAMPLES_STATIC_GLFW "Link MuJoCo sample apps against GLFW statically." ON)
-if(MUJOCO_SAMPLES_STATIC_GLFW)
+option(MUJOCO_EXTRAS_STATIC_GLFW "Link MuJoCo sample apps and simulate libraries against GLFW statically." OFF)
+if(MUJOCO_EXTRAS_STATIC_GLFW)
   set(BUILD_SHARED_LIBS_OLD ${BUILD_SHARED_LIBS})
   set(BUILD_SHARED_LIBS
       OFF
@@ -88,12 +88,12 @@ findorfetch(
   EXCLUDE_FROM_ALL
 )
 
-if(MUJOCO_SAMPLES_STATIC_GLFW)
+if(MUJOCO_EXTRAS_STATIC_GLFW)
   set(BUILD_SHARED_LIBS
       ${BUILD_SHARED_LIBS_OLD}
       CACHE BOOL "Build SHARED libraries" FORCE
   )
-  unset(BUILD_SHARED_LIBS_OLD)
+  unset(MUJOCO_EXTRAS_STATIC_GLFW)
 endif()
 
 if(NOT SAMPLE_STANDALONE)