Copy the data size of old uniforms to the new uniform when reinitializing shader uniforms after love.window.setMode.

Fixes a crash in the Data variant of Shader:send when it's called after setMode on a shader that was created before the setMode call.

src/modules/graphics/opengl/Shader.cpp

@@ -148,6 +148,7 @@ void Shader::mapActiveUniforms()
 		if (oldu != olduniforms.end())
 		{
 			u.data = oldu->second.data;
+			u.dataSize = oldu->second.dataSize;
 			u.textures = oldu->second.textures;
 
 			updateUniform(&u, u.count, true);