Removed FileLister::at

In the STL, 'at' will perform range checking while operator[] will not.
Since GMenu2X doesn't use exceptions, range checking is not possible,
so 'at' and operator[] were identical.

src/browsedialog.cpp

@@ -200,7 +200,7 @@ void BrowseDialog::directoryEnter()
 		path += "/";
 	}
 
-	setPath(path + fl.at(selected));
+	setPath(path + fl[selected]);
 
 	selected = 0;
 }

src/filelister.cpp

@@ -166,15 +166,8 @@ void FileLister::browse(const string& path, bool clean)
 
 string FileLister::operator[](uint x)
 {
-	return at(x);
+	const auto dirCount = directories.size();
-}
+	return x < dirCount ? directories[x] : files[x - dirCount];
-
-string FileLister::at(uint x)
-{
-	if (x < directories.size())
-		return directories[x];
-	else
-		return files[x-directories.size()];
 }
 
 void FileLister::insertFile(const string &file) {

src/filelister.h

@@ -40,7 +40,6 @@ public:
 	unsigned int fileCount() { return files.size(); }
 
 	std::string operator[](unsigned int);
-	std::string at(unsigned int);
 	bool isFile(unsigned int x) { return x >= directories.size(); }
 	bool isDirectory(unsigned int x) { return x < directories.size(); }