message: fix: line heights in basic email template
diff: </head>
  <body style="word-spacing: normal">
  - <div style="">
  + <div>
  <!-- Header -->
  <!--[if mso | IE]><table align="center" border="0" cellpadding="0" cellspacing="0" class="" role="presentation" style="width:600px;" width="600" bgcolor="linear-gradient(90deg, rgba(0,143,233,1) 0%, rgba(0,76,235,1) 100%)" ><tr><td style="line-height:0px;font-size:0px;mso-line-height-rule:exactly;"><![endif]-->
  <div
  style="
  font-family: Helvetica;
  font-size: 16px;
  - line-height: 20px;
  + line-height: 1;
  text-align: left;
  color: #000000;
  "
  font-family: Helvetica;
  font-size: 16px;
  font-weight: bold;
  - line-height: 20px;
  + line-height: 120%;
  margin: 0;
  text-decoration: none;
  text-transform: none;
  style="
  font-family: Helvetica;
  font-size: 16px;
  - line-height: 20px;
  + line-height: 1;
  text-align: left;
  color: #000000;
  "
  