fix: useBraces: whenNotSingleLine should not add braces when header end ln == statement end ln (#419)

Closes #416

Author: dsherret

src/generation/generate.rs

@@ -8034,7 +8034,7 @@ fn gen_conditional_brace_body<'a>(opts: GenConditionalBraceBodyOptions<'a>, cont
             if force_braces {
               Some(true)
             } else {
-              let is_multiple_lines = condition_helpers::is_multiple_lines(condition_context, start_header_ln.unwrap_or(start_lc.line), end_ln)?;
+              let is_multiple_lines = condition_helpers::is_multiple_lines(condition_context, end_header_ln.unwrap_or(start_lc.line), end_ln)?;
               Some(is_multiple_lines)
             }
           }

tests/specs/issues/issue0416.txt

@@ -0,0 +1,24 @@
+~~ indentWidth: 4, useBraces: whenNotSingleLine, singleBodyPosition: maintain ~~
+== should not add braces ==
+if (someFunction({
+    xyz: 1234
+})) return;
+if (someFunction({
+    xyz: 1234
+})) {
+    return;
+}
+
+[expect]
+if (
+    someFunction({
+        xyz: 1234,
+    })
+) return;
+if (
+    someFunction({
+        xyz: 1234,
+    })
+) {
+    return;
+}