aidl-format: 4-spaces indentation

Most users of AIDL are from Java where 4-space indentation is the
standard. Let's not change the practice.

Bug: 144540481
Test: aidl-format.sh
Change-Id: I04531938abc68555cd706a8950636fccceb0fbee
diff --git a/aidl-format.sh b/aidl-format.sh
index 06e4583..1030cca 100755
--- a/aidl-format.sh
+++ b/aidl-format.sh
@@ -60,7 +60,10 @@
       local input="$1"
       local temp="$(mktemp)"
       cat "$input" | clang-format \
-        --style='{BasedOnStyle: Google, BreakAfterJavaFieldAnnotations: false, ColumnLimit: 100}' \
+        --style='{BasedOnStyle: Google,
+        ColumnLimit: 100,
+        IndentWidth: 4,
+        ContinuationIndentWidth: 8}' \
         --assume-filename=${input%.*}.java \
         > "$temp"
       mv "$temp" "$input"