patch 8.2.2725: Vim9: message about compiling is wrong when using try/catch

Problem:    Vim9: message about compiling is wrong when using try/catch.
Solution:   Store the compiling flag with the message. (closes #8071)

src/ex_eval.c

@@ -292,6 +292,7 @@ cause_errthrow(
 		    // reaching do_errthrow().
 		    elem->sfile = estack_sfile(ESTACK_NONE);
 		    elem->slnum = SOURCING_LNUM;
+		    elem->msg_compiling = estack_compiling;
 		}
 	    }
 	}