chore: fix f32 emulation

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---

Author: anandkaranubc

lib/node_modules/@stdlib/math/base/special/spencef/lib/main.js

@@ -114,15 +114,15 @@ function spencef( x ) {
 		w = f32( -x );
 		flg |= 1;
 	} else {
-		w = x - ONE;
+		w = f32( x - ONE );
 	}
 	y = f32( -w * f32( polyvalA( w ) / polyvalB( w ) ) );
 	if ( flg & 1 ) {
 		y = f32( PI2O6 - f32( lnf( x )*lnf( ONE-x ) ) - y );
 	}
 	if ( flg & 2 ) {
 		z = lnf( x );
-		y = -f32( f32( HALF*z*z ) + y );
+		y = f32( -f32( f32( HALF * f32( z*z ) ) + y ) );
 	}
 	return y;
 }