Update QT_LOGGING_CONF if not set (#5578)

* Support logging config on install

* Support logging config on install

cockatrice/CMakeLists.txt

@@ -373,10 +373,10 @@ if(WIN32)
   )
 
   install(
-      DIRECTORY "${CMAKE_BINARY_DIR}/cockatrice/"
-      DESTINATION ./
-      FILES_MATCHING
-      PATTERN "*.ini"
+    DIRECTORY "${CMAKE_BINARY_DIR}/cockatrice/"
+    DESTINATION ./
+    FILES_MATCHING
+    PATTERN "*.ini"
   )
 
   # Qt plugins: audio (Qt5), iconengines, imageformats, multimedia (Qt6) platforms, printsupport (Qt5), styles, tls (Qt6)

cockatrice/src/main.cpp

@@ -190,8 +190,10 @@ int main(int argc, char *argv[])
     const QByteArray configPath = "";
 #endif
 
-    // Set the QT_LOGGING_CONF environment variable
-    qputenv("QT_LOGGING_CONF", configPath);
+    if (!qEnvironmentVariableIsSet(("QT_LOGGING_CONF"))) {
+        // Set the QT_LOGGING_CONF environment variable
+        qputenv("QT_LOGGING_CONF", configPath);
+    }
     qSetMessagePattern(
         "\033[0m[%{time yyyy-MM-dd h:mm:ss.zzz} "
         "%{if-debug}\033[36mD%{endif}%{if-info}\033[32mI%{endif}%{if-warning}\033[33mW%{endif}%{if-critical}\033[31mC%{"