OpenGLVideo: Fix a double free in AddFilter() when OptimiseFilters() fails

Fixes #11430
(cherry picked from commit 5769dca4c4ed442b62741e9abeeb2e3490d9b909)
MythUI: Fix use after free in MythUIEditBar

The call to ReleaseImages() in MythUIEditBar's dtor caused a free memory read
since SetRedraw() accesses its parent whose dtor has already been called.

Calling ReleaseImages() from MythUIEditBar's dtor also isn't necessary since the
images in m_images are children of MythUIEditBar and are automatically deleted
by Qt.

Fixes #11458, Refs #11402
(cherry picked from commit 6e0f69dca6a554f4baf0fe8f9226458d36c459c7)