Initial pgindent run for v12.

This is still using the 2.0 version of pg_bsd_indent.
I thought it would be good to commit this separately,
so as to document the differences between 2.0 and 2.1 behavior.

Discussion: https://postgr.es/m/16296.1558103386@sss.pgh.pa.us

src/backend/executor/nodeSubplan.c

@@ -684,7 +684,7 @@ execTuplesUnequal(TupleTableSlot *slot1,
 		/* Apply the type-specific equality function */
 		if (!DatumGetBool(FunctionCall2Coll(&eqfunctions[i],
 											collations[i],
-										attr1, attr2)))
+											attr1, attr2)))
 		{
 			result = true;		/* they are unequal */
 			break;