check if opcode.autogen is defined

prior to this change, was testing if it was true, which was not desired behavior

Tested by:
- watching page behavior for config with opcode true
- config with opcode false
- config with no opcode program
- config with no opcode study

All four combinations had expected log statements and opcode behavior

frontend/index.html

@@ -812,12 +812,14 @@ <h2 data-i18n="contact">Contact</h2>
         console.log("Dynamic Config result is", data);
 
         //create token and token url
-        if(data.opcode?.autogen) { //if the autogen property is set, use it
+        if(typeof data.opcode?.autogen !== 'undefined') { //if the autogen property is set, use it
+          console.log("found opcode setting, is", data.opcode.autogen);
           OPCODE_AUTOGEN = data.opcode?.autogen;
         } else { //else fall back to program vs study
+          console.log("falling back to program vs study", data.intro.program_or_study);
           OPCODE_AUTOGEN = data.intro.program_or_study == "study";
         }
-        
+
         if (OPCODE_AUTOGEN) {
           validateAndGenerateToken();
         } else {