deleted obsolete loader widget file (had snuck back in due to conflic… #1716

Job	Run time
Check Manifest	12s
linting	19s
ubuntu-latest py3.10	3m 49s
ubuntu-latest py3.11	3m 32s
ubuntu-latest py3.12	3m 47s
macos-13 py3.11	6m 44s
macos-latest py3.11	2m 54s
windows-latest py3.11	18m 49s
Build source distribution	0s
Publish build distributions	0s
	40m 6s

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