merge: remove useless dirstate.normallookup() invocation in applyupdates()
Explicit 'dirstate.normallookup()' invocation via 'dirtysubstate()' in
'applyupdates()' is useless now, because previous patch fixed the
relevant issue by writing in-memory dirstate changes out at the end of
dirty check.
'dirstate.normallookup()' invocation was introduced by
6becb9dbca25 to
avoid occasional test failure. This is partial backout of it (added
tests are still left).