Everywhere: Don't promote float to double where not needed

The `float => double => float` round trip seen in a couple of places
might pessimize the code. Even if it's truncated to an int in the end,
it's weird not to use the functions with the `f` suffixes when working
with single precision floats.

Userland/Libraries/LibGfx/AffineTransform.cpp

@@ -18,7 +18,7 @@ bool AffineTransform::is_identity() const
 static float hypotenuse(float x, float y)
 {
     // FIXME: This won't handle overflow :(
-    return sqrt(x * x + y * y);
+    return sqrtf(x * x + y * y);
 }
 
 float AffineTransform::x_scale() const