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Use an appropriate usage specifier for glBufferData

Turns out DYNAMIC was so horribly wrong that it slaughtered the GPU
performance.

--- a/src/Backends/Rendering/OpenGL3.cpp

+++ b/src/Backends/Rendering/OpenGL3.cpp

@@ -255,7 +255,7 @@

 	// Set up Vertex Buffer Object

 	glGenBuffers(1, &vertex_buffer_id);

 	glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer_id);

-	glBufferData(GL_ARRAY_BUFFER, sizeof(vertex_buffer), NULL, GL_DYNAMIC_DRAW);

+	glBufferData(GL_ARRAY_BUFFER, sizeof(vertex_buffer), NULL, GL_STREAM_DRAW);

 	// Set up the vertex attributes

 	glEnableVertexAttribArray(1);