Revert changes to the default settings

Reapplies the 10xndim default setting. Whilethe 30xndim is more robust, since we wont use default settings to pass the PP test it is overly burdensom of higher-mass runs to keep with this default.

bilby/core/sampler/dynesty.py

@@ -55,7 +55,7 @@ class Dynesty(NestedSampler):
         Method used to sample uniformly within the likelihood constraints,
         conditioned on the provided bounds
     walks: int
-        Number of walks taken if using `sample='rwalk'`, defaults to `ndim * 30`
+        Number of walks taken if using `sample='rwalk'`, defaults to `ndim * 10`
     dlogz: float, (0.1)
         Stopping criteria
     verbose: Bool
@@ -156,7 +156,7 @@ class Dynesty(NestedSampler):
 
     def _verify_kwargs_against_default_kwargs(self):
         if not self.kwargs['walks']:
-            self.kwargs['walks'] = self.ndim * 30
+            self.kwargs['walks'] = self.ndim * 10
         if not self.kwargs['update_interval']:
             self.kwargs['update_interval'] = int(0.6 * self.kwargs['nlive'])
         if not self.kwargs['print_func']: