split is_mobile to is_narrow and is_oled

is_mobile doesn't really make sense for android tablets. We were
overloading this variable to mean "is_narrow". What we really want is
is_oled for mobile devices and is_narrow for if its phone-like.

Signed-off-by: William Casarin <jb55@jb55.com>

src/test_data.rs

@@ -92,10 +92,10 @@ pub fn get_test_accounts() -> Vec<UserAccount> {
         .collect()
 }
 
-pub fn test_app(is_mobile: bool) -> Damus {
+pub fn test_app() -> Damus {
     let db_dir = Path::new(".");
     let path = db_dir.to_str().unwrap();
-    let mut app = Damus::mock(path, is_mobile);
+    let mut app = Damus::mock(path);
 
     let accounts = get_test_accounts();
     for account in accounts {