Use std::clamp() instead of various custom implementations

PR #19501.

src/base/bittorrent/sessionimpl.cpp

@@ -266,11 +266,7 @@ namespace
     {
         return [lower, upper](const T value) -> T
         {
-            if (value < lower)
-                return lower;
-            if (value > upper)
-                return upper;
-            return value;
+            return std::clamp(value, lower, upper);
         };
     }
 

src/base/preferences.cpp

@@ -29,6 +29,7 @@
 
 #include "preferences.h"
 
+#include <algorithm>
 #include <chrono>
 
 #ifdef Q_OS_MACOS
@@ -2122,7 +2123,7 @@ int Preferences::addNewTorrentDialogSavePathHistoryLength() const
 
 void Preferences::setAddNewTorrentDialogSavePathHistoryLength(const int value)
 {
-    const int clampedValue = qBound(0, value, 99);
+    const int clampedValue = std::clamp(value, 0, 99);
     const int oldValue = addNewTorrentDialogSavePathHistoryLength();
     if (clampedValue == oldValue)
         return;