changelog: drop the side_write argument to revlog splitting

The only user is now gone.

mercurial/changelog.py

@@ -387,9 +387,9 b' class changelog(revlog.revlog):'
                 tr.registertmp(new_index)
         return any_pending
 
-    def _enforceinlinesize(self, tr, side_write=True):
+    def _enforceinlinesize(self, tr):
         if not self.is_delaying:
-            revlog.revlog._enforceinlinesize(self, tr, side_write=side_write)
+            revlog.revlog._enforceinlinesize(self, tr)
 
     def read(self, nodeorrev):
         """Obtain data from a parsed changelog revision.

mercurial/revlog.py

@@ -2827,7 +2827,7 b' class revlog:'
             # manifest), no risk of collision.
             return self.radix + b'.i.s'
 
-    def _enforceinlinesize(self, tr, side_write=True):
+    def _enforceinlinesize(self, tr):
         """Check if the revlog is too big for inline and convert if so.
 
         This should be called after revisions are added to the revlog. If the
@@ -2857,7 +2857,6 b' class revlog:'
         tr.add(self._datafile, 0)
 
         new_index_file_path = None
-        if side_write:
             old_index_file_path = self._indexfile
             new_index_file_path = self._split_index_file
             opener = self.opener