JIRA ticket: LIMS-1902

Summary:

The MRC 2 Drop plate type is the only one with a drop_offset_x value, and it has not been used much. #973 fixed the display on creating such a plate and on first viewing it, but there is another view once the plate has inspections to view. This is to fix that view.

Changes:

• Use a new property to store the drop offset in pixels, so the offset isn't repeatedly converted
• Use the new offset pixels property to display the drop, the drop number, and to calculate the position for clicking/hovering
• Make the container type check be case-insensitive

To test:

• View a plate with inspections eg (/containers/cid/349468)
• Edit the plate in the database so the containerType is MRC 2 Drop

update Container set containerType='MRC 2 Drop' where containerId=349468;

• Check the wells and well numbers appear within the drawing of the plate
• Check you can hover over the wells and they are highlighted
• Check if you click on a well the inspection image is updated
• Change the capitalisation of the containerType and repeat the checks

update Container set containerType='mrc 2 drop' where containerId=349468;