Remove leading space in .gitattributes

Attempt to resolve git complaints about modified .in files on fresh
fetch.

Change-Id: I555ca0a9101c0e0cf965a032026df266ee41092f
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/60432
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/.gitattributes b/.gitattributes
index d6c87bf..c772c32 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -6,7 +6,7 @@
 *.gn text eol=lf
 *.gni text eol=lf
 *.h text eol=lf
- *.in text eol=lf
+*.in text eol=lf
 *.js text eol=lf
 *.md text eol=lf
 *.mm text eol=lf