Qt: Remove default "Unknown" in GameInfo struct

There is no need to initialize these anymore.
The game list already uses its own fallback string constants if needed.

rpcs3/Emu/GameInfo.h

@@ -9,12 +9,12 @@ struct GameInfo
 	std::string icon_path;
 	std::string movie_path;
 
-	std::string name = "Unknown";
+	std::string name;
-	std::string serial = "Unknown";
+	std::string serial;
-	std::string app_ver = "Unknown";
+	std::string app_ver;
-	std::string version = "Unknown";
+	std::string version;
-	std::string category = "Unknown";
+	std::string category;
-	std::string fw = "Unknown";
+	std::string fw;
 
 	u32 attr = 0;
 	u32 bootable = 0;

rpcs3/rpcs3qt/game_list_frame.cpp

@@ -497,6 +497,7 @@ void game_list_frame::OnParsingFinished()
 			game.serial = dir_or_elf.substr(dir_or_elf.find_last_of(fs::delim) + 1);
 			game.category = cat::cat_ps3_os.toStdString(); // Key for operating system executables
 			game.version = utils::get_firmware_version();
+			game.app_ver = game.version;
 			game.fw = game.version;
 			game.bootable = 1;
 			game.icon_path = dev_flash + "vsh/resource/explore/icon/icon_home.png";
@@ -516,7 +517,7 @@ void game_list_frame::OnParsingFinished()
 				}
 			}
 
-			if (game.name == "Unknown")
+			if (game.name.empty())
 			{
 				game.name = game.serial;
 			}