Fix 1 pixel wide images

Images are rounded up to 4 bytes per line minimum, so one pixel wide
images might not shrink when resizing.

Fixes: QTBUG-83179
Change-Id: If72c94409e4c899c5ad05b2867f5f53a94d0580f
Reviewed-by: Christian Kamm <mail@ckamm.de>

src/gui/image/qimage_conversions.cpp

@@ -426,8 +426,8 @@ bool convert_generic_inplace(QImageData *data, QImage::Format dst_format, Qt::Im
             data->nbytes = params.totalSize;
         }
         data->bytes_per_line = params.bytesPerLine;
-        data->depth = destDepth;
     }
+    data->depth = destDepth;
     data->format = dst_format;
     return true;
 }