Use a fancy stl function as recommended by cppcheck

It's just for fun, seemed like a neat trick the compiler recommended.

src/crontabPrinter.cpp

@@ -12,6 +12,7 @@
 #include <QPainter>
 #include <QPrintDialog>
 #include <QPrinter>
+#include <numeric>
 
 #include <KLocalizedString>
 
@@ -279,10 +280,7 @@ void CrontabPrinter::drawTable(const QList<int> &columnWidths)
 {
     mPainter->translate(0, -mCurrentRowPosition + computeMargin());
 
-    int columnWidthsTotal = 0;
-    for (int columnWidth : columnWidths) {
-        columnWidthsTotal += columnWidth;
-    }
+    int columnWidthsTotal = std::accumulate(columnWidths.begin(), columnWidths.end(), 0);
 
     const int margin = computeMargin();
     int linePositionX = margin;

src/crontablib/ctSaveStatus.cpp

@@ -14,10 +14,10 @@ CTSaveStatus::CTSaveStatus()
 }
 
 CTSaveStatus::CTSaveStatus(const QString &errorMessage, const QString &detailErrorMessage)
+    : mErrorStatus(true)
+    , mError(errorMessage)
+    , mDetailError(detailErrorMessage)
 {
-    mErrorStatus = true;
-    mError = errorMessage;
-    mDetailError = detailErrorMessage;
 }
 
 QString CTSaveStatus::errorMessage() const