fixes tests

tests/constructors/t5965_1.nim

@@ -1,3 +1,9 @@
+discard """
+  errormsg: "When mixing named fields and unnamed fields, every field needs to be initialized in order"
+  file: "t5965_1.nim"
+  line: 10
+"""
+
 type Foo = object
   a, b, c: int
 

tests/constructors/t5965_2.nim

@@ -1,5 +1,5 @@
 discard """
-  errormsg: "incorrect object construction syntax"
+  errormsg: "The object construction is given more fields than required"
   file: "t5965_2.nim"
   line: 10
 """