Remove unnecessary variable self-assignment

Assigning an int variable to itself is unnecessary and pointless, remove
them.

styles/qplastiquestyle.cpp:932:23: warning: explicitly assigning a
variable of type 'int' to itself [-Wself-assign]
                width = width;
                ~~~~~ ^ ~~~~~
styles/qplastiquestyle.cpp:939:23: warning: explicitly assigning a
variable of type 'int' to itself [-Wself-assign]
                width = width;
                ~~~~~ ^ ~~~~~

Change-Id: I0118874028bf43992bcce07f87b46b48868436cc
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>

src/widgets/styles/qplastiquestyle.cpp

@@ -929,14 +929,12 @@ static QString elliditide(const QString &text, const QFontMetrics &fontMetrics,
             int width = fontMetrics.width(leftHalf + ellipsis + rightHalf);
             if (width < rect.width()) {
                 title = leftHalf + ellipsis + rightHalf;
-                width = width;
                 break;
             }
             rightHalf.remove(0, 1);
             width = fontMetrics.width(leftHalf + ellipsis + rightHalf);
             if (width < rect.width()) {
                 title = leftHalf + ellipsis + rightHalf;
-                width = width;
                 break;
             }
         }