gl_shader_manager: Remove unintentionally committed #pragma

src/video_core/renderer_opengl/gl_shader_manager.h

@@ -12,8 +12,6 @@
 #include "video_core/renderer_opengl/gl_resource_manager.h"
 #include "video_core/renderer_opengl/gl_device.h"
 
-#pragma optimize("", off)
-
 namespace OpenGL {
 
 class ProgramManager {