nixos/modules: remove trailing whitespace

This leads to ci failure otherwise if the file gets changed.
git-blame can ignore whitespace changes.

nixos/modules/services/games/minetest-server.nix

@@ -5,12 +5,12 @@ with lib;
 let
   cfg   = config.services.minetest-server;
   flag  = val: name: if val != null then "--${name} ${val} " else "";
-  flags = [ 
-    (flag cfg.gameId "gameid") 
-    (flag cfg.world "world") 
-    (flag cfg.configPath "config") 
-    (flag cfg.logPath "logfile") 
-    (flag cfg.port "port") 
+  flags = [
+    (flag cfg.gameId "gameid")
+    (flag cfg.world "world")
+    (flag cfg.configPath "config")
+    (flag cfg.logPath "logfile")
+    (flag cfg.port "port")
   ];
 in
 {
@@ -26,7 +26,7 @@ in
         type        = types.nullOr types.str;
         default     = null;
         description = ''
-          Id of the game to use. To list available games run 
+          Id of the game to use. To list available games run
           `minetestserver --gameid list`.
 
           If only one game exists, this option can be null.
@@ -59,7 +59,7 @@ in
         type        = types.nullOr types.path;
         default     = null;
         description = ''
-          Path to logfile for logging. 
+          Path to logfile for logging.
 
           If set to null, logging will be output to stdout which means
           all output will be catched by systemd.

nixos/modules/services/games/terraria.nix

@@ -7,7 +7,7 @@ let
   worldSizeMap = { small = 1; medium = 2; large = 3; };
   valFlag = name: val: optionalString (val != null) "-${name} \"${escape ["\\" "\""] (toString val)}\"";
   boolFlag = name: val: optionalString val "-${name}";
-  flags = [ 
+  flags = [
     (valFlag "port" cfg.port)
     (valFlag "maxPlayers" cfg.maxPlayers)
     (valFlag "password" cfg.password)