Removed rebar2 case in rebar.config.script

* introduced by 505d35996d
* rebar2 is now deprecated [1].

[1] https://github.com/rebar/rebar

rebar.config.script

@@ -1,24 +1,7 @@
-IsRebar3 = case application:get_key(rebar, vsn) of
-               {ok, Vsn} ->
-                   [MajorVersion|_] = string:tokens(Vsn, "."),
-                   (list_to_integer(MajorVersion) >= 3);
-               undefined ->
-                   false
-           end,
-
-Rebar2Deps = [
-              {cf, ".*", {git, "https://github.com/project-fifo/cf", {tag, "0.2.2"}}}
-             ],
-
 NoDialWarns = {dialyzer, [{warnings, [no_unknown]}]},
 OTPRelease  = erlang:list_to_integer(erlang:system_info(otp_release)),
-WarnsRemoved = case OTPRelease<26 of
-		   true  -> fun(Config) -> Config end;
-		   false -> fun(Config) -> lists:keystore(dialyzer, 1, Config, NoDialWarns) end
-	       end,
 
-case IsRebar3 of
+case OTPRelease<26 of
-    true -> WarnsRemoved(CONFIG);
+    true  -> CONFIG;
-    false ->
+    false -> lists:keystore(dialyzer, 1, CONFIG, NoDialWarns)
-        lists:keyreplace(deps, 1, WarnsRemoved(CONFIG), {deps, Rebar2Deps})
 end.