fix: order validation checks by parameter position in stats/base/dists/cauchy/quantile

Move `isnan( p )` to the front so the validation prologue follows declaration
order `(p, x0, gamma)`. Supersedes the prior majority-vote ordering on this
branch. Behavior unchanged: any matching branch returns `NaN`.

Author: claude

lib/node_modules/@stdlib/stats/base/dists/cauchy/quantile/lib/main.js

@@ -74,10 +74,10 @@ var PI = require( '@stdlib/constants/float64/pi' );
 */
 function quantile( p, x0, gamma ) {
 	if (
-		isnan( gamma ) ||
+		isnan( p ) ||
 		isnan( x0 ) ||
+		isnan( gamma ) ||
 		gamma <= 0.0 ||
-		isnan( p ) ||
 		p < 0.0 ||
 		p > 1.0
 	) {