Update flathub files.

flatpak/0003-desktop-file.patch

@@ -1,20 +1,26 @@
 --- a/SamTFE/serioussam.desktop	2024-01-25 13:57:23.483929853 +0300
-+++ a/SamTFE/serioussam.desktop	2024-01-25 14:00:54.558511402 +0300
-@@ -5,5 +5,6 @@
++++ b/SamTFE/serioussam.desktop	2024-01-25 14:00:54.558511402 +0300
+@@ -1,9 +1,9 @@
+-
+ [Desktop Entry]
+ Name=Serious Sam The First Encounter
+ Type=Application
  Comment=Linux port of Serious Sam Classic The First Encounter
  Exec=serioussam
  TryExec=serioussam
 -Icon=serioussam
+-Categories=Application;Game;
 +Icon=io.itch.tx00100xt.SeriousSamClassic
- Categories=Application;Game;
-+Keywords=serious;sam;first;person;shooter;singleplayer;multiplayer
++Categories=Game;ActionGame;Shooter;
++Keywords=serious;sam;first;person;shooter;singleplayer;multiplayer;
 --- a/SamTSE/serioussamse.desktop	2024-01-25 13:57:23.483929853 +0300
-+++ a/SamTSE/serioussamse.desktop	2024-01-25 14:00:54.558511402 +0300
++++ b/SamTSE/serioussamse.desktop	2024-01-25 14:00:54.558511402 +0300
 @@ -5,5 +5,6 @@
  Comment=Linux port of Serious Sam Classic The Second Encounter
  Exec=serioussamse
  TryExec=serioussamse
 -Icon=serioussam
 +Icon=io.itch.tx00100xt.SeriousSamClassic
- Categories=Application;Game;
+-Categories=Application;Game;
++Categories=Game;ActionGame;Shooter;
 +Keywords=serious;sam;first;person;shooter;singleplayer;multiplayer;

flatpak/io.itch.tx00100xt.SeriousSamClassic.metainfo.xml

@@ -4,7 +4,7 @@
 <component type="desktop">
   <id>io.itch.tx00100xt.SeriousSamClassic</id>
   <name>SeriousSamClassic</name>
-  <summary>SeriousSamClassic is a Serious-Engine GPL source port</summary>
+  <summary>Open source first person shooter based on Serious-Engine</summary>
   <metadata_license>CC0-1.0</metadata_license>
   <project_license>GPL-2.0</project_license>
 
@@ -19,7 +19,7 @@
   <launchable type="desktop-id">io.itch.tx00100xt.SeriousSamClassic.SE.desktop</launchable>
 
   <description>
-    <p>SeriousSamClassic  is open source game engine version developed by Croteam for Serious Sam Classic (Windows, Linux, FreeBSD, OpenBSD, Raspberry Pi OS, macOS). Based on https://github.com/Croteam-official/Serious-Engine and linux port https://github.com/icculus/Serious-Engine, but it should work on (or be easily portable to) any system that supports OpenGL 1.3 and SDL2.
+    <p>SeriousSamClassic is open source game engine version developed by Croteam for Serious Sam Classic, but it should work on (or be easily portable to) any system that supports OpenGL 1.3 and SDL2.
     </p>
     <p>Note that while the Serious-Engine source code has been released under GPL, you still need to legally own the game and provide Serious Sam Classic The First Encounter and Serious Sam Classic The Second Encounter the game data to play. See the How to Install section for more information.
     </p>