Change ConstructorInitializerWidth in .clang-format from 4 to 8

We aren't consistent about this but having it at 4 seems to be causing style churn in code I've been editting recently. Also I prefer something other than 4 so that initalizers don't align with the constructor body.

BUG=skia:

Change-Id: I6ae850c34324e792dfd717f449634abcc7be010b
Reviewed-on: https://skia-review.googlesource.com/6030
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/.clang-format b/.clang-format
index 978571d..ff81590 100644
--- a/.clang-format
+++ b/.clang-format
@@ -49,7 +49,7 @@
 ColumnLimit:     100
 CommentPragmas:  '^ IWYU pragma:'
 ConstructorInitializerAllOnOneLineOrOnePerLine: true
-ConstructorInitializerIndentWidth: 4
+ConstructorInitializerIndentWidth: 8
 ContinuationIndentWidth: 8
 Cpp11BracedListStyle: true
 DerivePointerAlignment: false