Remove Tweeter test

--- a/tests/tester.nim
+++ b/tests/tester.nim
@@ -286,10 +286,5 @@ when isMainModule:
     issue150(useStdLib=true)
     customRouterTest(useStdLib=false)
     customRouterTest(useStdLib=true)
-
-    # Verify that Nim in Action Tweeter still compiles.
-    test "Nim in Action - Tweeter":
-      let path = "tests/nim-in-action-code/Chapter7/Tweeter/src/tweeter.nim"
-      check execCmd("nim c --path:. " & path) == QuitSuccess
   finally:
     doAssert execCmd("kill -15 " & $serverProcess.processID()) == QuitSuccess