cfg: tweaks to analog binding UI (#434)

## Link to GitHub Issue, if one exists
n/a

## Description of change
Add the raw device handle string to tooltip.
Add `Reset` button that clears all values.

## Testing
manual testing

src/spice2x/cfg/analog.h

@@ -82,18 +82,23 @@ public:
         return this->index != 0xFF;
     }
 
-    inline void clearBindings() {
-        device_identifier = "";
-        index = 0xFF;
+    inline void resetValues() {
         setSensitivity(1.f);
         setDeadzone(0.f);
         invert = false;
         smoothing = false;
+        deadzone_mirror = false;
         setMultiplier(1);
         setRelativeMode(false);
         setDelayBufferDepth(0);
     }
 
+    inline void clearBindings() {
+        device_identifier = "";
+        index = 0xFF;
+        resetValues();
+    }
+
     inline const std::string &getName() const {
         return this->name;
     }