Remove redundant spaces in _outA_Expr() output

Since WRITE_NODE_FIELD() output always starts with a space, we don't
need to go out of our way to print another space right before it.

This change is only for visual appearance; the tokenizer on the
reading side would read it the same way (but there is no read support
for A_Expr at this time anyway).

src/backend/nodes/outfuncs.c

@@ -545,16 +545,13 @@ _outA_Expr(StringInfo str, const A_Expr *node)
 	switch (node->kind)
 	{
 		case AEXPR_OP:
-			appendStringInfoChar(str, ' ');
 			WRITE_NODE_FIELD(name);
 			break;
 		case AEXPR_OP_ANY:
-			appendStringInfoChar(str, ' ');
 			WRITE_NODE_FIELD(name);
 			appendStringInfoString(str, " ANY");
 			break;
 		case AEXPR_OP_ALL:
-			appendStringInfoChar(str, ' ');
 			WRITE_NODE_FIELD(name);
 			appendStringInfoString(str, " ALL");
 			break;