Fixed bar chart X-axes

Sometimes the labels on the X-axis for analytics bar charts (Listens by Agent, Listens by OS) would not be horizontally aligned properly, making the bars appear to represent incorrect numbers. The numeric labels for each row never contained incorrect values, and individual bars in the chart were always correctly proportioned relative to one another. This was purely a cosmetic issue with the alignment of the X-axis labels. The labels are now positioned correctly.