Fix all warnings from the cppcoreguidelines-pro-type-member-init clang-tidy check (#4426)

src/providers/twitch/TwitchChannel.hpp

@@ -328,7 +328,7 @@ private:
     const QString subscriptionUrl_;
     const QString channelUrl_;
     const QString popoutPlayerUrl_;
-    int chatterCount_;
+    int chatterCount_{};
     UniqueAccess<StreamStatus> streamStatus_;
     UniqueAccess<RoomModes> roomModes_;
     std::atomic_flag loadingRecentMessages_ = ATOMIC_FLAG_INIT;
@@ -376,7 +376,7 @@ private:
      * The index of the twitch connection in
      * 7TV's user representation.
      */
-    size_t seventvUserTwitchConnectionIndex_;
+    size_t seventvUserTwitchConnectionIndex_{};
 
     /**
      * The next moment in time to signal activity in this channel to 7TV.

src/providers/twitch/TwitchMessageBuilder.hpp

@@ -127,7 +127,7 @@ private:
     QString roomID_;
     bool hasBits_ = false;
     QString bits;
-    int bitsLeft;
+    int bitsLeft{};
     bool bitsStacked = false;
     bool historicalMessage_ = false;
     std::shared_ptr<MessageThread> thread_;

src/providers/twitch/api/Helix.hpp

@@ -355,7 +355,7 @@ struct HelixVip {
 
 struct HelixChatters {
     std::unordered_set<QString> chatters;
-    int total;
+    int total{};
     QString cursor;
 
     HelixChatters() = default;