Clean up compiler warnings (#2027)

Fix the following compiler warning
../src/common/NetworkResult.hpp: In constructor ‘chatterino::NetworkResult::NetworkResult(const QByteArray&, int)’:
../src/common/NetworkResult.hpp:28:16: warning: ‘chatterino::NetworkResult::data_’ will be initialized after [-Wreorder]
   28 |     QByteArray data_;
      |                ^~~~~
../src/common/NetworkResult.hpp:27:9: warning:   ‘int chatterino::NetworkResult::status_’ [-Wreorder]
   27 |     int status_;
      |         ^~~~~~~
../src/common/NetworkResult.cpp:9:1: warning:   when initialized here [-Wreorder]
    9 | NetworkResult::NetworkResult(const QByteArray &data, int status)

* Clang compiler warnings

Fixes every instance of the following error:

In file included from ../src/widgets/settingspages/CommandPage.cpp:12:
In file included from ../src/controllers/commands/CommandModel.hpp:5:
../src/common/SignalVectorModel.hpp:242:10: warning: 'moveRows' overrides a member function but is not marked 'override' [-Winconsistent-missing-override]
    bool moveRows(const QModelIndex &sourceParent, int sourceRow, int count,
         ^
../src/controllers/commands/CommandModel.hpp:12:29: note: in instantiation of template class 'chatterino::SignalVectorModel<chatterino::Command>' requested here
class CommandModel : public SignalVectorModel<Command>

src/common/SignalVectorModel.hpp

@@ -240,7 +240,8 @@ public:
     }
 
     bool moveRows(const QModelIndex &sourceParent, int sourceRow, int count,
-                  const QModelIndex &destinationParent, int destinationChild)
+                  const QModelIndex &destinationParent,
+                  int destinationChild) override
     {
         if (count != 1)
         {
@@ -287,7 +288,7 @@ public:
         return {"chatterino_row_id"};
     }
 
-    QMimeData *mimeData(const QModelIndexList &list) const
+    QMimeData *mimeData(const QModelIndexList &list) const override
     {
         if (list.length() == 1)
         {