Use a more random hash to generate user colors

Fixes an issue where most uses just had their color determined by their username length and distributes the colors a bit more evenly.

src/Utils.cpp

@@ -656,7 +656,7 @@ utils::generateContrastingHexColor(const QString &input, const QColor &backgroun
     auto hash = hashQString(input);
     // create a hue value based on the hash of the input.
     // Adapted to make Nico blue
-    auto userHue = static_cast<int>((hash - 45) % 360);
+    auto userHue = static_cast<int>((hash - static_cast<uint32_t>(45)) % 360);
     // start with moderate saturation and lightness values.
     auto sat       = 230;
     auto lightness = 125;