use GL_DYNAMIC_DRAW for ellipse entity meshes

src/main.cpp

@@ -151,7 +151,8 @@ initEllipseEntity(RenderState* rs, GameOrbit* orbit, u32 num_vertices)
 				rg->shader->num_vertex_attribs,
 				rg->shader->attrib_mappings,
 				"ellipse 01",
-				GL_LINES);
+				GL_LINES,
+				GL_DYNAMIC_DRAW);
 
 	return e;
 }