Make bool_to_int_with_if a pedantic lint

In all the cases I've observed, it did not make the code clearer. Using
bools as integer is frowned upon in some languages, in others it's
simply not possible.

You can find comments on the original pull request rust-lang#8131 that agree with
this point of view.

Author: hrxi

clippy_lints/src/bool_to_int_with_if.rs

@@ -13,7 +13,7 @@ declare_clippy_lint! {
     /// this lint suggests using a `from()` function or an `as` coercion.
     ///
     /// ### Why is this bad?
-    /// Coercion or `from()` is idiomatic way to convert bool to a number.
+    /// Coercion or `from()` is another way to convert bool to a number.
     /// Both methods are guaranteed to return 1 for true, and 0 for false.
     ///
     /// See https://doc.rust-lang.org/std/primitive.bool.html#impl-From%3Cbool%3E
@@ -39,7 +39,7 @@ declare_clippy_lint! {
     /// ```
     #[clippy::version = "1.65.0"]
     pub BOOL_TO_INT_WITH_IF,
-    style,
+    pedantic,
     "using if to convert bool to int"
 }
 declare_lint_pass!(BoolToIntWithIf => [BOOL_TO_INT_WITH_IF]);