Surface Sim in TVB v2.* no longer has possibility to range Cortex.local_coupling_strength

We identified this missing functionality in TVB version 2.* when a user reported a problem in TVB older versions 1.5.*:

https://groups.google.com/g/tvb-users/c/i2hdTcAEBc8

We suspect it will be enough to change the parent class for

class SimulatorRMFragment(FormWithRanges)

 
We should investigate if this fix is enough, and if the change does not induce new problems in tvb surface simulations