fix appveyor issues

osu.Game.Rulesets.Catch/Mods/CatchModDifficultyAdjust.cs

@@ -48,4 +48,4 @@ namespace osu.Game.Rulesets.Catch.Mods
             difficulty.OverallDifficulty = ApproachRate.Value;
         }
     }
-}
+}

osu.Game.Rulesets.Mania/Mods/ManiaModDifficultyAdjust.cs

@@ -19,4 +19,4 @@ namespace osu.Game.Rulesets.Mania.Mods
             Precision = 0.1F,
         };
     }
-}
+}

osu.Game.Rulesets.Osu/Mods/OsuModDifficultyAdjust.cs

@@ -49,4 +49,4 @@ namespace osu.Game.Rulesets.Osu.Mods
             Precision = 0.1F,
         };
     }
-}
+}

osu.Game.Rulesets.Taiko/Mods/TaikoModDifficultyAdjust.cs

@@ -29,4 +29,4 @@ namespace osu.Game.Rulesets.Taiko.Mods
             Precision = 0.1F,
         };
     }
-}
+}

osu.Game/Rulesets/Mods/ModDifficultyAdjust.cs

@@ -37,7 +37,7 @@ namespace osu.Game.Rulesets.Mods
             difficulty.DrainRate = DrainRate != null ? DrainRate.Value : difficulty.DrainRate;
             difficulty.CircleSize = CircleSize != null ? CircleSize.Value : difficulty.CircleSize;
             difficulty.ApproachRate = ApproachRate != null ? ApproachRate.Value : difficulty.ApproachRate;
-            difficulty.OverallDifficulty = OverallDifficulty != null ? OverallDifficulty.Value: difficulty.OverallDifficulty;
+            difficulty.OverallDifficulty = OverallDifficulty != null ? OverallDifficulty.Value : difficulty.OverallDifficulty;
         }
     }
-}
+}