v↑ tempstorage(ZODB4) 2.12.2 -> 3-nxd

In 6e696faa "v↑ tempstorage 2.12.2 -> 5.2(ZODB5) 3-nxd(ZODB4-wc2)" we upgraded
tempstorage for ZODB5 and ZODB4-wc2, but were careful and left tempstorage,
that was being used with ZODB4, intact. However @tomo suggests that we should
also upgrade tempstorage for ZODB4 because of the loadBefore fixes and not to
further grow divergence in between ZODB4 and ZODB4-wc2:

    I understand that keeping the same version of tempstorage for ZODB 4 is to
    be on the safe side but I'd rather change it to tempstorage4-wc2 anyway. I mean
    we have a bugfix but we are afraid to apply it. Also, The less difference
    between ZODB 4 and ZODB 4-wc2 the better (everything will be more tested this way).
    ( !1009 (comment 137985) )

-> So let's do that.

component/tempstorage/buildout.cfg

@@ -45,14 +45,6 @@ eggs    = ${:egg}
 egg-versions =
   tempstorage = 5.2
 
-# tempstorage4 is plain upstream egg, but better be changed to be the same as
-# tempstorage4-wc2 because of loadBefore fixes.
-[tempstorage4]
-<= tempstorage5
-
-egg-versions =
-  tempstorage = 2.12.2
-
 
 # tempstorage4-wc2 is tempstorage 3 + backports for loadBefore fixes
 [tempstorage4-wc2]
@@ -69,3 +61,8 @@ branch  = 3-nxd
 revision= 77b49295db78
 location = ${buildout:parts-directory}/tempstorage
 git-executable = ${git:location}/bin/git
+
+
+# tempstorage4 is the same as tempstorage4-wc2 because of loadBefore fixes.
+[tempstorage4]
+<= tempstorage4-wc2