fix: use correct ErrorMessageID for EmptyCatchOrFinallyBlock

Previously we were always assigning this to `EmptyCatchOrFinallyBlockID`
but both `EmptyCatchBlock` and `EmptyCatchAndFinallyBlock` both use this
class and pass in their corresponding `ErrorMessageID`. This caused the
following two code samples to give the same `ErrorMessageID` when they
should have been different than they currently are:

```scala
try {}
```

```scala
try {} catch {} finally {}
```

The second one gave this as an error:

```
scala> try {} catch {} finally {}
-- [E000] Syntax Error: --------------------------------------------------------
1 |try {} catch {} finally {}
  |       ^^^^^^^^
  |       The catch block does not contain a valid expression, try
  |       adding a case like - case e: Exception => to the block
  |
  | longer explanation available when compiling with `-explain`

```

When the ID should `E001`, `EmptyCatchBlockId`. Now this correctly
returns:

```
scala> try {} catch{} finally {}
-- [E001] Syntax Error: --------------------------------------------------------
1 |try {} catch{} finally {}
  |       ^^^^^^^
  |       The catch block does not contain a valid expression, try
  |       adding a case like - case e: Exception => to the block
  |
  | longer explanation available when compiling with `-explain`
```

The first example with the missing catch and finally block should
actually be `[E002]`.

compiler/src/dotty/tools/dotc/reporting/messages.scala

@@ -78,7 +78,7 @@ import transform.SymUtils._
     def kind = "Reference"
 
   abstract class EmptyCatchOrFinallyBlock(tryBody: untpd.Tree, errNo: ErrorMessageID)(using Context)
-  extends SyntaxMsg(EmptyCatchOrFinallyBlockID) {
+  extends SyntaxMsg(errNo) {
     def explain = {
       val tryString = tryBody match {
         case Block(Nil, untpd.EmptyTree) => "{}"

compiler/test-resources/repl/i13208.default.scala

@@ -1,6 +1,6 @@
 scala> try 1
 1 warning found
--- [E000] Syntax Warning: ------------------------------------------------------
+-- [E002] Syntax Warning: ------------------------------------------------------
 1 | try 1
   | ^^^^^
   | A try without catch or finally is equivalent to putting

tests/neg-custom-args/nowarn/nowarn-parser-error.check

@@ -4,7 +4,7 @@
   |      an identifier expected, but 'def' found
   |
   | longer explanation available when compiling with `-explain`
--- [E000] Syntax Warning: tests/neg-custom-args/nowarn/nowarn-parser-error.scala:2:10 ----------------------------------
+-- [E002] Syntax Warning: tests/neg-custom-args/nowarn/nowarn-parser-error.scala:2:10 ----------------------------------
 2 |  def a = try 1 // warn
   |          ^^^^^
   |          A try without catch or finally is equivalent to putting