aconfig: update codegen templates

This change removes empty lines and spaces in generated code.

Bug: 311152507
Test: atest aconfig.test
Change-Id: Ib41e633323ffcce348299afa5a09bd0252db1bb9
diff --git a/tools/aconfig/templates/rust_exported.template b/tools/aconfig/templates/rust_exported.template
index b31bcef..110f2d4 100644
--- a/tools/aconfig/templates/rust_exported.template
+++ b/tools/aconfig/templates/rust_exported.template
@@ -4,23 +4,22 @@
 pub struct FlagProvider;
 
 lazy_static::lazy_static! \{
-    {{ for flag in template_flags }}
+{{ for flag in template_flags }}
     /// flag value cache for {flag.name}
     static ref CACHED_{flag.name}: bool = flags_rust::GetServerConfigurableFlag(
         "aconfig_flags.{flag.device_config_namespace}",
         "{flag.device_config_flag}",
         "false") == "true";
-    {{ endfor }}
+{{ endfor }}
 }
 
 impl FlagProvider \{
-
-    {{ for flag in template_flags }}
+{{ for flag in template_flags }}
     /// query flag {flag.name}
     pub fn {flag.name}(&self) -> bool \{
         *CACHED_{flag.name}
     }
-    {{ endfor }}
+{{ endfor }}
 
 }