Don't zoom QRCode

shadowsocks-csharp/View/QRCodeForm.Designer.cs

@@ -40,7 +40,7 @@
             this.pictureBox1.Margin = new System.Windows.Forms.Padding(0);
             this.pictureBox1.Name = "pictureBox1";
             this.pictureBox1.Size = new System.Drawing.Size(210, 210);
-            this.pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.Zoom;
+            this.pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.CenterImage;
             this.pictureBox1.TabIndex = 1;
             this.pictureBox1.TabStop = false;
             //