Normalize email place holder value

Use a more neutral exemple domain already in use

static/app-strings.json

@@ -550,7 +550,6 @@
   "Go Back": "Go Back",
   "Sign In To LBRY": "Sign In To LBRY",
   "Create a new account or sign in.": "Create a new account or sign in.",
-  "hotstuff_96@hotmail.com": "hotstuff_96@hotmail.com",
   "Terms of Service": "Terms of Service",
   "Learn More": "Learn More",
   "Confirm Your Email": "Confirm Your Email",

ui/component/userEmailNew/view.jsx

@@ -97,7 +97,7 @@ function UserEmailNew(props: Props) {
             <Form onSubmit={handleSubmit} className="section">
               <FormField
                 autoFocus
-                placeholder={__('hotstuff_96@hotmail.com')}
+                placeholder={__('yourstruly@example.com')}
                 type="email"
                 name="sign_up_email"
                 label={__('Email')}

ui/component/userEmailReturning/view.jsx

@@ -77,7 +77,7 @@ function UserEmailReturning(props: Props) {
               <Form onSubmit={handleSubmit} className="section">
                 <FormField
                   autoFocus={!emailExistsFromUrl}
-                  placeholder={__('hotstuff_96@hotmail.com')}
+                  placeholder={__('yourstruly@example.com')}
                   type="email"
                   id="username"
                   autoComplete="on"

ui/component/userPasswordReset/view.jsx

@@ -68,7 +68,7 @@ function UserPasswordReset(props: Props) {
               <FormField
                 autoFocus
                 disabled={passwordResetSuccess}
-                placeholder={__('hotstuff_96@hotmail.com')}
+                placeholder={__('yourstruly@example.com')}
                 type="email"
                 name="sign_in_email"
                 id="username"