aconfig: remove support for --format=text

This CL is part of a larger effort to simplify maintenance by removing
format aliases: with the new --format option, clients of `aconfig dump`
can specify the format they need themselves.

This CL removes the last of the format aliases.

Bug: 317044914
Test: m
Change-Id: I09b706b9931a85a86c17be359902245b9b53d584
diff --git a/tools/aconfig/src/main.rs b/tools/aconfig/src/main.rs
index 59f3677..6c4e241 100644
--- a/tools/aconfig/src/main.rs
+++ b/tools/aconfig/src/main.rs
@@ -114,7 +114,9 @@
                     Arg::new("format")
                         .long("format")
                         .value_parser(|s: &str| DumpFormat::try_from(s))
-                        .default_value("text"),
+                        .default_value(
+                            "{fully_qualified_name} [{container}]: {permission} + {state}",
+                        ),
                 )
                 .arg(
                     Arg::new("filter")