Small fix for code snippets for Lie type representations

[rvisser7]

This is a small fix for displaying the code snippets for Lie type representations for abstract groups, in the particular case where groups have multiple Lie type representations using the same group family. E.g. the group 168.42 can be represented as both $\text{PSL}(2,7)$ and $\text{PSL}(3,2)$.

Before, the relevant code snippet was stored in the code dictionary as code['PSL'], which caused different code snippets for the same Lie type group families to be overwritten. This is now implemented where the key also includes the $n$ and $q$ values. I.e. now stored in the code dictionary separately as code[('PSL', 2, 7)] and code[('PSL', 3, 2)]

E.g.:
https://beta.lmfdb.org/Groups/Abstract/168.42
http://localhost:37777/Groups/Abstract/168.42

Before:

After: