patch 8.2.1898: command modifier parsing always uses global cmdmod

Problem:    Command modifier parsing always uses global cmdmod.
Solution:   Pass in cmdmod_T to use.  Rename struct fields consistently.
diff --git a/src/indent.c b/src/indent.c
index d786f26..a9d406e 100644
--- a/src/indent.c
+++ b/src/indent.c
@@ -1049,7 +1049,7 @@
 	smsg(NGETTEXT("%ld line indented ",
 						 "%ld lines indented ", i), i);
     }
-    if (!cmdmod.lockmarks)
+    if ((cmdmod.cmod_flags & CMOD_LOCKMARKS) == 0)
     {
 	// set '[ and '] marks
 	curbuf->b_op_start = oap->start;