Remove constant width, that was wrong.

Use Nico's suggestion to just leverage the width of the field, and leave
a comment.

src/UserSettingsPage.cpp

@@ -437,10 +437,16 @@ UserSettingsPage::resizeEvent(QResizeEvent *event)
 {
         auto preWidth = width();
 
-        if (preWidth * 0.5 > LayoutMinWidth)
+        // based on the width of the widest item currently in the layout
+        // deviceFingerprintValue_ used for recalculating the margins of
+        // the formLayout_ on resize to help with small screens and mobile devices.
+
+        double minFormWidth = deviceFingerprintValue_->width();
+
+        if (preWidth * 0.5 > minFormWidth)
                 sideMargin_ = preWidth * 0.25;
         else
-                sideMargin_ = static_cast<double>(preWidth - LayoutMinWidth) / 2.;
+                sideMargin_ = static_cast<double>(preWidth - minFormWidth) / 2.;
 
         if (sideMargin_ < 60)
                 sideMargin_ = 0;

src/UserSettingsPage.h

@@ -33,11 +33,6 @@ constexpr int OptionMargin       = 6;
 constexpr int LayoutTopMargin    = 50;
 constexpr int LayoutBottomMargin = LayoutTopMargin;
 
-// based on the width of the widest item currently in the layout (deviceFingerprintValue_)
-// used for recalculating the margins of the formLayout_ on resize to help with small screens and
-// mobile devices.
-constexpr int LayoutMinWidth = 385;
-
 class UserSettings : public QObject
 {
         Q_OBJECT