change FIXME about copying GLMesh to TODO

this is not really a priority, since the current implementation is
working

src/shader.cpp

@@ -328,7 +328,7 @@ initGLAttribBuffer(GLBuffer* buf, GLenum target, GLVertexAttrib* attrib)
 	buf->name = utilAllocateCStr(attrib->name);
 }
 
-// FIXME: might as well pass in pointer to GLMesh, since that's how we're
+// TODO: might as well pass in pointer to GLMesh, since that's how we're
 // 	going to use this, can void copying GLMesh twice that way
 GLMesh
 loadGLMesh(MemoryArena* arena,