Remove `namespace fs=fs`

Having these inside functions is silly and redundant now.

src/qt/guiutil.cpp

@@ -686,8 +686,6 @@ bool SetStartOnSystemStartup(bool fAutoStart)
 
 fs::path static GetAutostartDir()
 {
-    namespace fs = fs;
-
     char* pszConfigHome = getenv("XDG_CONFIG_HOME");
     if (pszConfigHome) return fs::path(pszConfigHome) / "autostart";
     char* pszHome = getenv("HOME");

src/qt/intro.cpp

@@ -69,7 +69,6 @@ FreespaceChecker::FreespaceChecker(Intro *_intro)
 
 void FreespaceChecker::check()
 {
-    namespace fs = fs;
     QString dataDirStr = intro->getPathToCheck();
     fs::path dataDir = GUIUtil::qstringToBoostPath(dataDirStr);
     uint64_t freeBytesAvailable = 0;
@@ -189,7 +188,6 @@ QString Intro::getDefaultDataDirectory()
 
 bool Intro::pickDataDirectory()
 {
-    namespace fs = fs;
     QSettings settings;
     /* If data directory provided on command line, no need to look at settings
        or show a picking dialog */

src/util.cpp

@@ -513,7 +513,6 @@ void PrintExceptionContinue(const std::exception* pex, const char* pszThread)
 
 fs::path GetDefaultDataDir()
 {
-    namespace fs = fs;
     // Windows < Vista: C:\Documents and Settings\Username\Application Data\Bitcoin
     // Windows >= Vista: C:\Users\Username\AppData\Roaming\Bitcoin
     // Mac: ~/Library/Application Support/Bitcoin
@@ -544,7 +543,6 @@ static CCriticalSection csPathCached;
 
 const fs::path &GetDataDir(bool fNetSpecific)
 {
-    namespace fs = fs;
 
     LOCK(csPathCached);
 
@@ -789,8 +787,6 @@ void ShrinkDebugFile()
 #ifdef WIN32
 fs::path GetSpecialFolderPath(int nFolder, bool fCreate)
 {
-    namespace fs = fs;
-
     char pszPath[MAX_PATH] = "";
 
     if(SHGetSpecialFolderPathA(NULL, pszPath, nFolder, fCreate))