By Mimosa Spencer PARIS (Reuters) – The world’s largest cosmetic group L’Oreal is expected to report brisk fourth-quarter sales on Wednesday after pandemic-weary consumers emerged from lockdowns to splash out on beauty products. Investors will look for the impact of increased marketing spending on L’Oreal’s margin, and tune in to executives’ results presentation Thursday for any clues on whether sporadic lockdowns to curb the coronavirus might have weighed on cosmetic sales in China. The purveyor of Maybelline and Lancome brands does not disclose business targets. It is expected to post like-f…