build: Fix ENABLE_WALLET option

The removed commands were left over from the transition from
autodetection to explicit options. These commands prevented the
`-DENABLE_WALLET=OFF` option from being work properly when building with
depends.

CMakeLists.txt

@@ -103,14 +103,12 @@ if(WITH_SQLITE)
     find_package(SQLite3 3.7.17 REQUIRED)
   endif()
   set(USE_SQLITE ON)
-  set(ENABLE_WALLET ON)
 endif()
 option(WITH_BDB "Enable Berkeley DB (BDB) wallet support." OFF)
 cmake_dependent_option(WARN_INCOMPATIBLE_BDB "Warn when using a Berkeley DB (BDB) version other than 4.8." ON "WITH_BDB" OFF)
 if(WITH_BDB)
   find_package(BerkeleyDB 4.8 MODULE REQUIRED)
   set(USE_BDB ON)
-  set(ENABLE_WALLET ON)
   if(NOT BerkeleyDB_VERSION VERSION_EQUAL 4.8)
     message(WARNING "Found Berkeley DB (BDB) other than 4.8.\n"
                     "BDB (legacy) wallets opened by this build will not be portable!"