[fix] Properly multiline multi-statement ParenNode expressions (#867)

Author: reese

fixtures/small/paren_multi_stmt_actual.rb

@@ -0,0 +1,5 @@
+(true; true)
+
+cond1 &&
+  (pattern_match_me => { foo: }; true) &&
+  cond3

fixtures/small/paren_multi_stmt_expected.rb

@@ -0,0 +1,11 @@
+(
+  true
+  true
+)
+
+cond1 &&
+  (
+    pattern_match_me => {foo:}
+    true
+  ) &&
+  cond3

librubyfmt/src/format_prism.rs

@@ -3126,7 +3126,7 @@ fn format_parentheses_node<'src>(
                                 format_node(ps, stmt);
                             });
                             if idx < statements.len() - 1 {
-                                ps.emit_soft_newline();
+                                ps.emit_newline();
                             }
                         }
                     } else {