heatmap labels of the cells clusters are squished

[jjyotikataria]

@nturaga @hawrobin @teslajoy @jweiser @SolomonShorser-OICR

Hi everyone, could you please possibly help me out to fix the label spacing issue of the clusters shown by reactomegsa for the single cell data. As shown in the figure, the data label on the x axis is cropped.