gl_rasterizer: Remove redundant scissor state change.

There is no need to disable this state after the draw call,
gl_state will handle this for us if needed. This kind of
redundant state changes are bad for the driver overhead,
as flipping bits will invalidate the driver state.

src/video_core/renderer_opengl/gl_rasterizer.cpp

@@ -783,9 +783,6 @@ bool RasterizerOpenGL::Draw(bool accelerate, bool is_indexed) {
         }
     }
 
-    // Disable scissor test
-    state.scissor.enabled = false;
-
     vertex_batch.clear();
 
     // Unbind textures for potential future use as framebuffer attachments