Fix /getprinters to use GET request type

samy.js

@@ -234,7 +234,7 @@ async function fetchSites() {
 
   try {
     const resp = await fetch("/getpw", {
-      method: "GET",
+      method: "POST",
       headers: { "Content-Type": "application/json" },
       body: JSON.stringify({ password: pwd }),
     });
@@ -265,7 +265,7 @@ async function fetchSites() {
 // =======================================================================
 let allPrinters = [];
 
-// GET /getprinters with password from Devices tab
+// GET /getprinters with password from Devices tab (sent via SAMYPW header)
 async function fetchPrinters() {
   const pwdInput = document.getElementById("PrinterPassword");
   const pwd = pwdInput?.value;
@@ -291,8 +291,7 @@ async function fetchPrinters() {
   try {
     const resp = await fetch("/getprinters", {
       method: "GET",
-      headers: { "Content-Type": "application/json" },
-      body: JSON.stringify({ password: pwd }),
+      headers: { SAMYPW: pwd },
     });
 
     if (!resp.ok) throw new Error("HTTP " + resp.status);