Minor fixes in file manager.

The listFiles function returns absolute paths, so the condition if ((*i)=="..") doesn't have a sense. I added a check for absolute paths (file == name + "/.."). Btw. what about Windows? Does it return 'name + "\\.." ' or so?

I also enabled recursive removing of directories on Android. It is needed for example when you have already installed STK with extracted data files, and then you want to upgrade STK to newer version.

src/io/file_manager.cpp

@@ -1245,10 +1245,8 @@ void FileManager::listFiles(std::set<std::string>& result,
 {
     result.clear();
 
-#ifndef ANDROID
     if(!isDirectory(dir))
         return;
-#endif
 
     io::path previous_cwd = m_file_system->getWorkingDirectory();
 
@@ -1315,26 +1313,37 @@ bool FileManager::removeDirectory(const std::string &name) const
 {
     std::set<std::string> files;
     listFiles(files, name, /*is full path*/ true);
-    for(std::set<std::string>::iterator i=files.begin(); i!=files.end(); i++)
+
+    for (std::string file : files)
     {
-        if((*i)=="." || (*i)=="..") continue;
-        if(UserConfigParams::logMisc())
+        if (file == "." || file == ".." || file == name + "/." || 
+            file == name + "/..") 
+            continue;
+
+        if (UserConfigParams::logMisc())
             Log::verbose("FileManager", "Deleting directory '%s'.",
-                         (*i).c_str());
-        if(isDirectory(*i))
+                         file.c_str());
+
+        if (isDirectory(file))
         {
             // This should not be necessary (since this function is only
             // used to remove addons), and it limits the damage in case
             // of any bugs - i.e. if name should be "/" or so.
-            // removeDirectory(full_path);
+            // We need to remove whole data directory on Android though, i.e.
+            // when we install newer STK version and new assets are extracted.
+            // So enable it only for Android for now.
+            #ifdef ANDROID
+            removeDirectory(file);
+            #endif
         }
         else
         {
-            removeFile(*i);
+            removeFile(file);
         }
     }
+    
 #if defined(WIN32)
-        return RemoveDirectory(name.c_str())==TRUE;
+    return RemoveDirectory(name.c_str())==TRUE;
 #else
     return remove(name.c_str())==0;
 #endif