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

Fixes #11430
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