Merge #16350: qt: Remove unused guard

d003110351 Remove unused guard (Hennadii Stepanov)

Pull request description:

  `BITCOIN_QT_TEST` is no longer used since switching to autotools build system.

  Some historical refs:
  - #807
  - #4241

ACKs for top commit:
  practicalswift:
    utACK d003110351
  promag:
    ACK d003110351.
  jonasschnelli:
    Verified ACK d003110351

Tree-SHA512: 1242ef7927d2dbd2e47cdb50de6ebb20e4ac427a66a37b4d4de8ca1b50581d34f818cb576fc9fdfb3e7dd7259d11812e3807da33b3357850d67548b837d5549b

src/qt/bitcoin.cpp

@@ -413,7 +413,6 @@ static void SetupUIArgs()
     gArgs.AddArg("-uiplatform", strprintf("Select platform to customize UI for (one of windows, macosx, other; default: %s)", BitcoinGUI::DEFAULT_UIPLATFORM), true, OptionsCategory::GUI);
 }
 
-#ifndef BITCOIN_QT_TEST
 int GuiMain(int argc, char* argv[])
 {
 #ifdef WIN32
@@ -593,4 +592,3 @@ int GuiMain(int argc, char* argv[])
     }
     return rv;
 }
-#endif // BITCOIN_QT_TEST