Fixed the internal color mask state not being updated when love.graphics.setColorMask is called.

src/modules/graphics/opengl/Graphics.cpp

@@ -898,6 +898,7 @@ std::vector<Canvas *> Graphics::getCanvas() const
 void Graphics::setColorMask(ColorMask mask)
 {
 	glColorMask(mask.r, mask.g, mask.b, mask.a);
+	states.back().colorMask = mask;
 }
 
 Graphics::ColorMask Graphics::getColorMask() const

src/modules/graphics/opengl/wrap_Graphics.cpp

@@ -168,7 +168,7 @@ int w_stencil(lua_State *L)
 	instance()->drawToStencilBuffer(true);
 
 	// Call stencilfunc()
-    lua_pushvalue(L, 1);
+	lua_pushvalue(L, 1);
 	lua_call(L, 0, 0);
 
 	instance()->drawToStencilBuffer(false);