[weather] Use override with subclass destructors (clang-tidy, just for you)

libs/plasmaweather/weatherlocation.h

@@ -32,7 +32,7 @@ class WeatherLocation : public QObject
     Q_OBJECT
 public:
     explicit WeatherLocation(QObject *parent = nullptr);
-    virtual ~WeatherLocation();
+    ~WeatherLocation() override;
 
     /**
      * Get default source

libs/plasmaweather/weathervalidator.h

@@ -34,7 +34,7 @@ class PLASMAWEATHER_EXPORT WeatherValidator : public QObject
     Q_OBJECT
 public:
     explicit WeatherValidator(QObject *parent = nullptr);
-    virtual ~WeatherValidator();
+    ~WeatherValidator() override;
 
     /**
      * Validate location