OPENGL: Prefer single operation texture updates.

When doing glTexSubImage2D we do not need to assure that the source data has
the same width as the texture when we want to update the data, we just need
to assure that the width * Bpp cound matches the pitch.

backends/graphics/opengl/gltexture.cpp

@@ -149,7 +149,7 @@ void GLTexture::updateBuffer(const void *buf, int pitch, GLuint x, GLuint y, GLu
 	glBindTexture(GL_TEXTURE_2D, _textureName); CHECK_GL_ERROR();
 
 	// Check if the buffer has its data contiguously
-	if (static_cast<int>(w) * _bytesPerPixel == pitch && w == _textureWidth) {
+	if (static_cast<int>(w) * _bytesPerPixel == pitch) {
 		glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, w, h,
 						_glFormat, _glType, buf); CHECK_GL_ERROR();
 	} else {