Fix warning: -Wmaybe-uninitialized

In file included from apps/opencs/model/world/pathgrid.hpp:7,
                 from apps/opencs/model/world/idcollection.hpp:15,
                 from apps/opencs/model/world/idcollection.cpp:1:
In constructor ‘constexpr ESM::Pathgrid::Pathgrid(ESM::Pathgrid&&)’,
    inlined from ‘constexpr CSMWorld::Pathgrid::Pathgrid(CSMWorld::Pathgrid&&)’ at apps/opencs/model/world/pathgrid.hpp:24:12,
    inlined from ‘constexpr CSMWorld::Record<CSMWorld::Pathgrid>::Record(CSMWorld::Record<CSMWorld::Pathgrid>&&)’ at apps/opencs/model/world/record.hpp:39:12,
    inlined from ‘std::__detail::__unique_ptr_t<_Tp> std::make_unique(_Args&& ...) [with _Tp = CSMWorld::Record<CSMWorld::Pathgrid>; _Args = {CSMWorld::Record<CSMWorld::Pathgrid>}]’ at /usr/include/c++/13.2.1/bits/unique_ptr.h:1070:30,
    inlined from ‘std::unique_ptr<CSMWorld::RecordBase> CSMWorld::Record<ESXRecordT>::modifiedCopy() const [with ESXRecordT = CSMWorld::Pathgrid]’ at apps/opencs/model/world/record.hpp:92:116:
components/esm3/loadpgrd.hpp:19:12: warning: ‘<unnamed>.CSMWorld::Record<CSMWorld::Pathgrid>::mBase.CSMWorld::Pathgrid::<unnamed>.ESM::Pathgrid::mData’ may be used uninitialized [-Wmaybe-uninitialized]
   19 |     struct Pathgrid
      |            ^~~~~~~~
In file included from apps/opencs/model/world/idcollection.hpp:8:
apps/opencs/model/world/record.hpp: In member function ‘std::unique_ptr<CSMWorld::RecordBase> CSMWorld::Record<ESXRecordT>::modifiedCopy() const [with ESXRecordT = CSMWorld::Pathgrid]’:
apps/opencs/model/world/record.hpp:92:53: note: ‘<anonymous>’ declared here
   92 |         return std::make_unique<Record<ESXRecordT>>(Record<ESXRecordT>(State_ModifiedOnly, nullptr, &(this->get())));
      |                                                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

apps/opencs/model/world/record.hpp

@@ -19,6 +19,11 @@ namespace CSMWorld
 
         State mState;
 
+        explicit RecordBase(State state)
+            : mState(state)
+        {
+        }
+
         virtual ~RecordBase() = default;
 
         virtual std::unique_ptr<RecordBase> clone() const = 0;
@@ -69,21 +74,18 @@ namespace CSMWorld
 
     template <typename ESXRecordT>
     Record<ESXRecordT>::Record()
-        : mBase()
+        : RecordBase(State_BaseOnly)
+        , mBase()
         , mModified()
     {
     }
 
     template <typename ESXRecordT>
     Record<ESXRecordT>::Record(State state, const ESXRecordT* base, const ESXRecordT* modified)
+        : RecordBase(state)
+        , mBase(base == nullptr ? ESXRecordT{} : *base)
+        , mModified(modified == nullptr ? ESXRecordT{} : *modified)
     {
-        if (base)
-            mBase = *base;
-
-        if (modified)
-            mModified = *modified;
-
-        this->mState = state;
     }
 
     template <typename ESXRecordT>