Raking panel network plots don't match

The 2 network plots in the ranking panel do not match in their node sizing.

Steps to reproduce:
- Go to Bayesian analysis
- Run analysis in tab 3a.
- Go to tab 3c.
- In the *Ranking Results* panel, select "*Radial SUCRA*"
- In the "Summary of evidence" panel, select "*Number of trials indicated by node size and line thickness*"
- See that the "Placebo" node is smaller than that of "Sibutramine" in the centre panel, but larger in the right-hand panel

The code used to generate the network in the centre of the radial SUCRA plot can probably be refactored and reused to generate both types of network plot in the right-hand panel.