remove new tf1s from filters.lib because it already existed

filters.lib

@@ -1293,20 +1293,6 @@ with {
   a2d = (a0 - a1*c + csq)/d;
 };
 
-//-----------------------------`(fi.)tf1s`-------------------------------
-// First-order special case of tf2s above
-//
-// #### Usage
-//
-// ```
-// _ : tf1s(b1,b0,a0) : _
-// ```
-//----------------------------------------------
-declare tf1s author "Julius O. Smith III";
-declare tf1s copyright "Copyright (C) 2003-2019 by Julius O. Smith III <[email protected]>";
-declare tf1s license "MIT-style STK-4.3 license";
-tf1s(b1,b0,a0,w1) = fi.tf2s(b1,b0,0,a0,0,w1); // FIXME: Faust compiler does not fully optimize - does C++?
-
 //-----------------------------`(fi.)tf1snp`-------------------------------
 // First-order special case of tf2snp above
 //