patch 9.0.1529: code style test doesn't check for space after "if"

Problem:    Code style test doesn't check for space after "if".
Solution:   Add a test for space.
diff --git a/src/cindent.c b/src/cindent.c
index 176bc05..9b2b644 100644
--- a/src/cindent.c
+++ b/src/cindent.c
@@ -1854,8 +1854,8 @@
     // Handle C++ namespace.
     buf->b_ind_cpp_namespace = 0;
 
-    // Handle continuation lines containing conditions of if(), for() and
-    // while().
+    // Handle continuation lines containing conditions of if (), for () and
+    // while ().
     buf->b_ind_if_for_while = 0;
 
     // indentation for # comments
@@ -3317,7 +3317,7 @@
 			}
 
 			// Special trick: when expecting the while () after a
-			// do, line up with the while()
+			// do, line up with the while ()
 			//     do
 			//	    x = 1;
 			// ->  here