fix singup screen issue

MobileApp/screens/Signup.js

@@ -77,7 +77,7 @@ function Signup({}) {
       </View>
       <View style={styles.text2}>
         <Text>Already have account? </Text>
-        <TouchableOpacity onPress={() => navigation.navigate("Login")} ><Text style={styles.signupText}> Login </Text></TouchableOpacity>
+        <TouchableOpacity onPress={() => navigation.navigate("Root")} ><Text style={styles.signupText}> Login </Text></TouchableOpacity>
       </View>
 
       {/* Username or Email Input Field */}