run-command.h: fix mis-indented struct member

An accidental conversion of a tab to 4 spaces snuck into 4c4066d
(run-command: move doc to run-command.h, 2019-11-17), messing up the
alignment when you have the project-recommended 8-width tabstops. Let's
revert that line.

Signed-off-by: Jeff King <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: peff

run-command.h

@@ -116,7 +116,7 @@ struct child_process {
 	unsigned no_stdin:1;
 	unsigned no_stdout:1;
 	unsigned no_stderr:1;
-    unsigned git_cmd:1; /* if this is to be git sub-command */
+	unsigned git_cmd:1; /* if this is to be git sub-command */
 
 	/**
 	 * If the program cannot be found, the functions return -1 and set