fix: use correct equation

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---

Author: anandkaranubc

lib/node_modules/@stdlib/math/base/special/gammainc/src/main.c

@@ -494,7 +494,7 @@ static double regularisedGammaPrefix( const double a, const double z ) {
 	}
 	if ( stdlib_base_abs(d*d*a) <= 100.0 && a > 150.0 ) {
 		// Special case for large a and a ~ z:
-		prefix = ( a * ( stdlib_base_log1pmx( d ) - d ) ) + ( z * ( 0.5-GAMMA_LANCZOS_G ) / agh );
+		prefix = ( a * stdlib_base_log1pmx( d ) ) + ( z * ( 0.5-GAMMA_LANCZOS_G ) / agh );
 		prefix = stdlib_base_exp( prefix );
 	}
 	else {