Replace foreach (deprecated) with range-for

The code compiles and konsole seems to work as bofore.

src/ShellCommand.cpp

@@ -76,7 +76,7 @@ QStringList ShellCommand::expand(const QStringList &items)
     QStringList result;
     result.reserve(items.size());
 
-    foreach (const QString &item, items) {
+    for (const QString &item : items) {
         result << expand(item);
     }