fixed_pipeline_state: explicitly use template keyword after 1f345ebe

In file included from src/video_core/renderer_opengl/renderer_opengl.cpp:25:
In file included from src/./video_core/renderer_opengl/gl_rasterizer.h:26:
In file included from src/./video_core/renderer_opengl/gl_fence_manager.h:11:
src/./video_core/fence_manager.h:91:32: error: use 'template' keyword
      to treat 'Write' as a dependent template name
                memory_manager.Write<u32>(current_fence->GetAddress(), current_fence->GetPayload());
                               ^
                               template
src/./video_core/fence_manager.h:137:32: error: use 'template'
      keyword to treat 'Write' as a dependent template name
                memory_manager.Write<u32>(current_fence->GetAddress(), current_fence->GetPayload());
                               ^
                               template