BIP70: Chainparams: DRY: Make qt/guiutil.cpp fit BIP70 chain name strings

As a side effect, the qt user will see "test" instead of "testnet"

src/qt/guiutil.cpp

@@ -581,12 +581,12 @@ TableViewLastColumnResizingFixer::TableViewLastColumnResizingFixer(QTableView* t
 #ifdef WIN32
 boost::filesystem::path static StartupShortcutPath()
 {
-    if (GetBoolArg("-testnet", false))
+    std::string chain = ChainNameFromCommandLine();
+    if (chain == CBaseChainParams::MAIN)
+        return GetSpecialFolderPath(CSIDL_STARTUP) / "Bitcoin.lnk";
+    if (chain == CBaseChainParams::TESTNET) // Remove this special case when CBaseChainParams::TESTNET = "testnet4"
         return GetSpecialFolderPath(CSIDL_STARTUP) / "Bitcoin (testnet).lnk";
-    else if (GetBoolArg("-regtest", false))
-        return GetSpecialFolderPath(CSIDL_STARTUP) / "Bitcoin (regtest).lnk";
-
-    return GetSpecialFolderPath(CSIDL_STARTUP) / "Bitcoin.lnk";
+    return GetSpecialFolderPath(CSIDL_STARTUP) / strprintf("Bitcoin (%s).lnk", chain);
 }
 
 bool GetStartOnSystemStartup()
@@ -719,15 +719,14 @@ bool SetStartOnSystemStartup(bool fAutoStart)
         boost::filesystem::ofstream optionFile(GetAutostartFilePath(), std::ios_base::out|std::ios_base::trunc);
         if (!optionFile.good())
             return false;
+        std::string chain = ChainNameFromCommandLine();
         // Write a bitcoin.desktop file to the autostart directory:
         optionFile << "[Desktop Entry]\n";
         optionFile << "Type=Application\n";
-        if (GetBoolArg("-testnet", false))
-            optionFile << "Name=Bitcoin (testnet)\n";
-        else if (GetBoolArg("-regtest", false))
-            optionFile << "Name=Bitcoin (regtest)\n";
-        else
+        if (chain == CBaseChainParams::MAIN)
             optionFile << "Name=Bitcoin\n";
+        else
+            optionFile << strprintf("Name=Bitcoin (%s)\n", chain);
         optionFile << "Exec=" << pszExePath << strprintf(" -min -testnet=%d -regtest=%d\n", GetBoolArg("-testnet", false), GetBoolArg("-regtest", false));
         optionFile << "Terminal=false\n";
         optionFile << "Hidden=false\n";