Removed unnecessary "using" statements.

These classes don't use any vectors.

src/browsedialog.h

@@ -30,7 +30,6 @@
 class FileLister;
 
 using std::string;
-using std::vector;
 
 class BrowseDialog : protected Dialog {
 protected:

src/filedialog.h

@@ -26,8 +26,6 @@
 #include "browsedialog.h"
 
 
-using std::vector;
-
 class FileDialog : public BrowseDialog {
 public:
 	FileDialog(GMenu2X *gmenu2x, const string &text, const string &filter="",