Auto merge of #16690 - roife:fix-issue-16471, r=Veykril

fix: use 4 spaces for indentation in macro expansion

Partial fix for #16471.

In the previous code, the indentation produced by macro expansion was set to 2 spaces. This PR modifies it to 4 spaces for the sake of consistency.

crates/ide/src/hover/tests.rs

@@ -6366,8 +6366,8 @@ fn main() { $0V; }
 
             ```rust
             pub const V: i8 = {
-              let e = 123;
-              f(e)
+                let e = 123;
+                f(e)
             }
             ```
         "#]],
@@ -6393,7 +6393,7 @@ fn main() { $0V; }
 
             ```rust
             pub static V: i8 = {
-              let e = 123;
+                let e = 123;
             }
             ```
         "#]],