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/hardware/thinkfan.nix

@@ -67,7 +67,7 @@ in {
         type = types.bool;
         default = false;
         description = ''
-          Whether to build thinkfan with SMART support to read temperatures 
+          Whether to build thinkfan with SMART support to read temperatures
           directly from hard disks.
         '';
       };

nixos/modules/services/hardware/trezord.nix

@@ -10,7 +10,7 @@ in {
   meta = {
     doc = ./trezord.xml;
   };
-  
+
   ### interface
 
   options = {
@@ -40,7 +40,7 @@ in {
       };
     };
   };
-  
+
   ### implementation
 
   config = mkIf cfg.enable {