message: Improve checkbox visibility by removing background transparency from css
diff: @@ -135,11 +135,9 @@ color:#333333;
  .QCheckBox { /* Checkbox Labels */
  color:#333333;
  -background-color:transparent;
  }
  .QCheckBox:hover {
  -background-color:transparent;
  }
  .QValidatedLineEdit, .QLineEdit { /* Text Entry Fields */
  @@ -1336,7 +1334,6 @@ border:1px solid #9e9e9e;
  QDialog#SendCoinsDialog .QCheckBox#checkUseObfuscation { /* Obfuscation Checkbox */
  color:#616161;
  font-weight:bold;
  -background:transparent;
  /*background: qradialgradient(cx:0.5, cy:0.5, radius: 0.5, fx:0.5, fy:0.5, stop:0 rgba(248, 246, 246, 128), stop: 1 rgba(0, 0, 0, 0));*/
  border-radius:5px;
  padding-top:20px;
  @@ -1346,7 +1343,6 @@ padding-bottom:18px;
  QDialog#SendCoinsDialog .QCheckBox#checkSwiftTX { /* SwiftTX Checkbox */
  color:#616161;
  font-weight:bold;
  -background:transparent;
  /*background: qradialgradient(cx:0.5, cy:0.5, radius: 0.5, fx:0.5, fy:0.5, stop:0 rgba(248, 246, 246, 128), stop: 1 rgba(0, 0, 0, 0));*/
  border-radius:5px;
  padding-top:20px;
  