Fix tests

src/test/run-make/translation/broken.ftl

@@ -1,3 +1,3 @@
 # `foo` isn't provided by this diagnostic so it is expected that the fallback message is used.
-parser-struct-literal-body-without-path = this is a {$foo} message
+parser_struct_literal_body_without_path = this is a {$foo} message
     .suggestion = this is a test suggestion

src/test/run-make/translation/missing.ftl

@@ -1,3 +1,3 @@
-# `parser-struct-literal-body-without-path` isn't provided by this resource at all, so the
+# `parser_struct_literal_body_without_path` isn't provided by this resource at all, so the
 # fallback should be used.
 foo = bar

src/test/run-make/translation/working.ftl

@@ -1,2 +1,2 @@
-parser-struct-literal-body-without-path = this is a test message
+parser_struct_literal_body_without_path = this is a test message
     .suggestion = this is a test suggestion

src/test/ui-fulldeps/fluent-messages/missing-message.ftl

@@ -1 +1 @@
-missing-message = 
+missing_message =

src/test/ui-fulldeps/fluent-messages/test.stderr

@@ -22,11 +22,11 @@ LL |         missing_message => "./missing-message.ftl",
    |
    = help: see additional errors emitted
 
-error: expected a message field for "missing-message"
+error: expected a message field for "missing_message"
  --> ./missing-message.ftl:1:1
   |
-1 | missing-message = 
-  | ^^^^^^^^^^^^^^^^^^
+1 | missing_message =
+  | ^^^^^^^^^^^^^^^^^
   |
 
 error: overrides existing message: `key`