Trivial: Add const modifier to GetHDChain and IsHDEnabled

Author: NicolasDorier

src/wallet/wallet.cpp

@@ -1329,7 +1329,7 @@ bool CWallet::SetHDChain(const CHDChain& chain, bool memonly)
     return true;
 }
 
-bool CWallet::IsHDEnabled()
+bool CWallet::IsHDEnabled() const
 {
     return !hdChain.masterKeyID.IsNull();
 }

src/wallet/wallet.h

@@ -1015,10 +1015,10 @@ class CWallet : public CCryptoKeyStore, public CValidationInterface
 
     /* Set the HD chain model (chain child index counters) */
     bool SetHDChain(const CHDChain& chain, bool memonly);
-    const CHDChain& GetHDChain() { return hdChain; }
+    const CHDChain& GetHDChain() const { return hdChain; }
 
     /* Returns true if HD is enabled */
-    bool IsHDEnabled();
+    bool IsHDEnabled() const;
 
     /* Generates a new HD master key (will not be activated) */
     CPubKey GenerateNewHDMasterKey();