Revert "Don't add elemental multiple times"

Commit reverted as it broke Fire, Cold and Lightning damage, causing the query to use AND instead of OR.
This reverts commit 7991a39.

IAGrim/UI/Filters/Damage.cs

@@ -42,17 +42,30 @@ public partial class Damage : UserControl {
                 if (dmgAcid.Checked)
                     dmgTypes.Add("Poison");
 
-                if (dmgElemental.Checked || dmgTypes.Contains("Fire") || dmgTypes.Contains("Cold") || dmgTypes.Contains("Lightning"))
+                if (dmgElemental.Checked)
                     dmgTypes.Add("Elemental");
 
                 if (totalDamage.Checked)
                     filters.Add(new[] {"offensiveTotalDamageModifier"});
 
-                foreach (var damageType in dmgTypes)
-                    filters.Add(new[] {
-                        $"offensive{damageType}",
-                        $"offensive{damageType}Modifier"
-                    });
+                foreach (var damageType in dmgTypes) {
+                    var isElemental = damageType.Equals("Fire") ||
+                                      damageType.Equals("Cold") ||
+                                      damageType.Equals("Lightning");
+
+                    if (isElemental)
+                        filters.Add(new[] {
+                            $"offensive{damageType}",
+                            $"offensive{damageType}Modifier",
+                            "offensiveElemental",
+                            "offensiveElementalModifier"
+                        });
+                    else
+                        filters.Add(new[] {
+                            $"offensive{damageType}",
+                            $"offensive{damageType}Modifier"
+                        });
+                }
 
                 return filters;
             }