Const correctness fix for optionlist

source_modules/audio_source/src/main.cpp

@@ -25,7 +25,7 @@ ConfigManager config;
 struct DeviceInfo {
     RtAudio::DeviceInfo info;
     int id;
-    bool operator==(const struct DeviceInfo& other) {
+    bool operator==(const struct DeviceInfo& other) const {
         return other.id == id;
     }
 };

source_modules/hermes_source/src/hermes.h

@@ -39,7 +39,7 @@ namespace hermes {
         uint8_t gatewareVerMin;
         BoardID boardId;
 
-        bool operator==(const Info& b) {
+        bool operator==(const Info& b) const {
             return !memcmp(mac, b.mac, 6);
         }
     };

source_modules/spectran_source/src/main.cpp

@@ -503,7 +503,7 @@ private:
     float refStep = 0.5;
 
     struct SRCombo {
-        bool operator==(const SRCombo& b) {
+        bool operator==(const SRCombo& b) const {
             return baseId == b.baseId && decimId == b.decimId;
         }