ids: Fix aliases for EquationValue and XLibValue

The alias statement for these two spellings was using `ConstantName`
instead of `ConstantValue`.

Signed-off-by: Christophe de Dinechin <christophe@dinechin.org>
Reported-by: Ed van Gasteren <Ed@vanGasteren.net>

Author: c3d

src/ids.tbl

@@ -852,8 +852,8 @@ NAMED(NegativeInfinity, "−∞")
 NAMED(Const, "LibraryConstant")
 CMD(ConstantName)                       ALIAS(ConstantName, "EquationName")
                                         ALIAS(ConstantName, "XLibName")
-CMD(ConstantValue)                      ALIAS(ConstantName, "EquationValue")
-                                        ALIAS(ConstantName, "XLibValue")
+CMD(ConstantValue)                      ALIAS(ConstantValue, "EquationValue")
+                                        ALIAS(ConstantValue, "XLibValue")
 CMD(StandardUncertainty)                ALIAS(StandardUncertainty, "CstSU")
 CMD(RelativeUncertainty)                ALIAS(RelativeUncertainty, "CstRU")
 NAMED(ToStandardUncertainty, "→Us")     ALIAS(ToStandardUncertainty, "→StdUnc")