tests: don't skip love.graphics.isActive test on vulkan

testing/tests/graphics.lua

@@ -1890,12 +1890,7 @@ end
 
 -- love.graphics.isActive
 love.test.graphics.isActive = function(test)
-  local name, version, vendor, device = love.graphics.getRendererInfo()
-  if string.find(name, 'Vulkan') ~= nil then
-    test:skipTest('love.graphics.isActive() crashes on Vulkan')
-  else 
-    test:assertTrue(love.graphics.isActive(), 'check graphics is active') -- i mean if you got this far
-  end
+  test:assertTrue(love.graphics.isActive(), 'check graphics is active') -- i mean if you got this far
 end