Clamp the biquad filter gain value to 0.00001

To actually prevent a potential divide-by-zero when the gain and reference
frequency are 0, instead of asserting.

core/filters/biquad.cpp

@@ -15,7 +15,7 @@ template<typename Real>
 void BiquadFilterR<Real>::setParams(BiquadType type, Real f0norm, Real gain, Real rcpQ)
 {
     // Limit gain to -100dB
-    assert(gain > 0.00001f);
+    gain = std::max(gain, Real(0.00001));
 
     const Real w0{al::numbers::pi_v<Real>*2.0f * f0norm};
     const Real sin_w0{std::sin(w0)};