COMP: Fix CTK PluginFramework library build

[jcfr]

Follow-up c0c8e41 (ENH: Improve setting of CTK_QT5_COMPONENTS based on actual requirements) fixing the check adding Sql to the list of components when CTK_ENABLE_PluginFramework

Before

$ cmake \
  -DCTK_ENABLE_PluginFramework:BOOL=ON \
  -DCMAKE_BUILD_TYPE:STRING=Release \
  -DQt5_DIR:PATH=$Qt5_DIR -DCTK_QT_VERSION:STRING=5 \
  ../CTK

[...]
-- Configuring CTK with Qt 5.15.2 (using modules: Core, Concurrent, Test, Designer)
-- SuperBuild - First pass
-- SuperBuild - First pass - done
[...]
-- SuperBuild - CTK[OK]
-- Configuring done (2.9s)
-- Generating done (0.0s)

After

$ rm -rf *
$ cmake \
  -DCTK_ENABLE_PluginFramework:BOOL=ON \
  -DCMAKE_BUILD_TYPE:STRING=Release \
  -DQt5_DIR:PATH=$Qt5_DIR -DCTK_QT_VERSION:STRING=5 \
  ../CTK

[...]
-- Configuring CTK with Qt 5.15.2 (using modules: Core, Concurrent, Sql, Test, Designer)
-- SuperBuild - First pass
-- SuperBuild - First pass - done
[...]
-- SuperBuild - CTK[OK]
-- Configuring done (2.9s)
-- Generating done (0.0s)