Fix mxid colors for dark theme

Signed-off-by: Ajay Bura <ajbura@gmail.com>

src/app/organisms/welcome/Welcome.jsx

@@ -10,7 +10,7 @@ function Welcome() {
     <div className="app-welcome flex--center">
       <div className="flex-v--center">
         <img className="app-welcome__logo noselect" src={CinnySvg} alt="Cinny logo" />
-        <Text className="app-welcome__heading" variant="h1" weight="medium">Welcome to Cinny</Text>
+        <Text className="app-welcome__heading" variant="h1" weight="medium" primary>Welcome to Cinny</Text>
         <Text className="app-welcome__subheading" variant="s1">Yet another matrix client</Text>
       </div>
     </div>