theme: left margin doesn't work for the plot_title parameter

[ASmirnov-HORIS]

Example:

ggplot() + geom_point(x=0) + ggtitle("Title") + theme(plot_title=element_text(margin=[5, 100]))

Output:

Expected:

[OLarionova-HORIS]

Fixed ignoring of horizontal margins for plot title/subtitle/caption.
The image below shows the bounding boxes (in light blue) after the margins have been applied: