Fix typo in file name

Author: siimav

Source/ROLib/Modules/ModuelROPayload.cs renamed to Source/ROLib/Modules/ModuleROPayload.cs

@@ -92,7 +92,7 @@
     <Compile Include="DebugTools\DebugDrawer.cs" />
     <Compile Include="DebugTools\DrawTools.cs" />
     <Compile Include="GlobalSuppressions.cs" />
-    <Compile Include="Modules\ModuelROPayload.cs" />
+    <Compile Include="Modules\ModuleROPayload.cs" />
     <Compile Include="Modules\ModuleROSolar.cs" />
     <Compile Include="Modules\ModuleROTank_KorolevCross.cs" />
     <Compile Include="Modules\ROLAnimateEngineHeat.cs" />