Fix indent for toggle_ignore

Example
---
```rust
mod indent {
    #[test$0]
    fn test() {}
}
```

**Before this PR**

```rust
mod indent {
    #[test]
#[ignore]
    fn test() {}
}
```
And re-enable
```rust
mod indent {
    #[test]
fn test() {}
}
```

**After this PR**

```rust
mod indent {
    #[test]
    #[ignore]
    fn test() {}
}
```

Author: A4-Tacks

src/tools/rust-analyzer/crates/ide-assists/src/handlers/toggle_ignore.rs

@@ -1,6 +1,6 @@
 use syntax::{
     AstNode, AstToken,
-    ast::{self, HasAttrs},
+    ast::{self, HasAttrs, edit::AstNodeEdit},
 };
 
 use crate::{AssistContext, AssistId, Assists, utils::test_related_attribute_syn};
@@ -27,13 +27,16 @@ pub(crate) fn toggle_ignore(acc: &mut Assists, ctx: &AssistContext<'_>) -> Optio
     let attr: ast::Attr = ctx.find_node_at_offset()?;
     let func = attr.syntax().parent().and_then(ast::Fn::cast)?;
     let attr = test_related_attribute_syn(&func)?;
+    let indent = attr.indent_level();
 
     match has_ignore_attribute(&func) {
         None => acc.add(
             AssistId::refactor("toggle_ignore"),
             "Ignore this test",
             attr.syntax().text_range(),
-            |builder| builder.insert(attr.syntax().text_range().end(), "\n#[ignore]"),
+            |builder| {
+                builder.insert(attr.syntax().text_range().end(), format!("\n{indent}#[ignore]"))
+            },
         ),
         Some(ignore_attr) => acc.add(
             AssistId::refactor("toggle_ignore"),
@@ -69,13 +72,17 @@ mod tests {
         check_assist(
             toggle_ignore,
             r#"
-            #[test$0]
-            fn test() {}
+            mod indent {
+                #[test$0]
+                fn test() {}
+            }
             "#,
             r#"
-            #[test]
-            #[ignore]
-            fn test() {}
+            mod indent {
+                #[test]
+                #[ignore]
+                fn test() {}
+            }
             "#,
         )
     }
@@ -85,13 +92,17 @@ mod tests {
         check_assist(
             toggle_ignore,
             r#"
-            #[test$0]
-            #[ignore]
-            fn test() {}
+            mod indent {
+                #[test$0]
+                #[ignore]
+                fn test() {}
+            }
             "#,
             r#"
-            #[test]
-            fn test() {}
+            mod indent {
+                #[test]
+                fn test() {}
+            }
             "#,
         )
     }