rawdata: update callers in context

We update callers incrementally because this help bisecting failures. This was
useful during development, so we expect it might be useful again in the future.

mercurial/context.py

@@ -1053,7 +1053,7 b' class filectx(basefilectx):'
                        filelog=self._filelog, changeid=changeid)
 
     def rawdata(self):
-        return self._filelog.revision(self._filenode, raw=True)
+        return self._filelog.rawdata(self._filenode)
 
     def rawflags(self):
         """low-level revlog flags"""