Fix issue number in test file names

[Cherry-picked 9cb9d4b]

Author: odersky

tests/neg/i19531.check renamed to tests/neg/i19351.check

@@ -1,4 +1,4 @@
--- Error: tests/neg/i19531/A.scala:3:35 --------------------------------------------------------------------------------
+-- Error: tests/neg/i19351/A.scala:3:35 --------------------------------------------------------------------------------
 3 | inline def myMacro(): x.type = ${myMacroExpr} // error
  | ^
- |Cyclic macro dependency; macro refers to a toplevel symbol in tests/neg/i19531/A.scala from which the macro is called
+ |Cyclic macro dependency; macro refers to a toplevel symbol in tests/neg/i19351/A.scala from which the macro is called

tests/neg/i19531/A.scala renamed to tests/neg/i19351/A.scala

@@ -1,8 +1,8 @@
--- Error: tests/neg/i19531a/Test.scala:8:34 ----------------------------------------------------------------------------
+-- Error: tests/neg/i19351a/Test.scala:8:34 ----------------------------------------------------------------------------
 8 |inline def not(b: Bool): Bool = ${notMacro('b)} // error // error
  | ^
- |Cyclic macro dependency; macro refers to a toplevel symbol in tests/neg/i19531a/Test.scala from which the macro is called
--- [E046] Cyclic Error: tests/neg/i19531a/Test.scala:8:46 --------------------------------------------------------------
+ |Cyclic macro dependency; macro refers to a toplevel symbol in tests/neg/i19351a/Test.scala from which the macro is called
+-- [E046] Cyclic Error: tests/neg/i19351a/Test.scala:8:46 --------------------------------------------------------------
 8 |inline def not(b: Bool): Bool = ${notMacro('b)} // error // error
  | ^
  | Cyclic reference involving method $anonfun