Fix some tabs in build.json

Change-Id: I27f95b1c5d5f2b3897118f020aee1ce09feefb55
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/80427
Commit-Queue: Adam Langley <agl@google.com>
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
Auto-Submit: David Benjamin <davidben@google.com>

build.json

diff --git a/build.json b/build.json
index cb50730..a24ee06 100644
--- a/build.json
+++ b/build.json
@@ -568,9 +568,9 @@
             "third_party/fiat/p256_64.h",
             "third_party/fiat/p256_64_msvc.h",
             "third_party/fiat/p256_field.c.inc",
-	    "third_party/fiat/p256_field_32.br.c.inc",
-	    "third_party/fiat/p256_field_64.br.c.inc",
-	    "third_party/fiat/p256_point.br.c.inc",
+            "third_party/fiat/p256_field_32.br.c.inc",
+            "third_party/fiat/p256_field_64.br.c.inc",
+            "third_party/fiat/p256_point.br.c.inc",
             "third_party/fiat/bedrock_unverified_bareminimum.c.inc",
             "third_party/fiat/bedrock_unverified_platform.c.inc"
         ],