Adopted lowercase => internal pattern for LFS3_tag_* tags

This includes the mask/rm/grow bits:

- LFS3_tag_RM
- LFS3_tag_GROW
- LFS3_tag_MASK0/2/8/12

Our in-device only handle types:

- LFS3_tag_ORPHAN
- LFS3_tag_TRV
- LFS3_tag_UNKNOWN

And in-device only tags with special behavior:

- LFS3_tag_INTERNAL
- LFS3_tag_RATTRS
- LFS3_tag_SHRUBCOMMIT
- LFS3_tag_GRMPUSH
- LFS3_tag_MOVE
- LFS3_tag_ATTRS

Usually I'm not a big fan of case-sensitive naming patterns, but this
has been useful for self-documenting what compat flags are in-device
only. Might as well extend the idea to our tag definitions.

tests/test_fwrite.toml

@@ -5001,7 +5001,7 @@ code = '''
         printf("pos = %d, %d\n", pos, weight);
         lfs3_bshrub_commit(&lfs3, &file.b, pos, LFS3_RATTRS(
                 LFS3_RATTR_DATA(
-                    LFS3_TAG_GROW | tag, -(weight/2),
+                    LFS3_tag_GROW | tag, -(weight/2),
                     &data))) => 0;
 
         pos = pos - (weight/2) + 1;
@@ -5111,7 +5111,7 @@ code = '''
         printf("pos = %d, %d\n", pos, weight);
         lfs3_bshrub_commit(&lfs3, &file.b, pos, LFS3_RATTRS(
                 LFS3_RATTR_DATA(
-                    LFS3_TAG_GROW | tag, -(weight/2),
+                    LFS3_tag_GROW | tag, -(weight/2),
                     &data))) => 0;
 
         pos = pos - (weight/2) + 1;