Handle GDrive expired token

[agrenott]

GDrive refresh tokens expire after 7 days on test accounts. In such case, force deletion of saved credential and full auth flow.

Close #40

[codacy-production[bot]]

Coverage summary from Codacy

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Coverage variation	Diff coverage
:white_check_mark: +0.19% (target: -1.00%)	:white_check_mark: 97.78%

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (073e26c6def922aa1ab5aaa86cca78f31572edd0) | 2846 | 2267 | 79.66% | | | Head commit (92ee78bf227c9ca6c2110829e6edaac5acaf1202) | 2879 (+33) | 2299 (+32) | 79.85% (**+0.19%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#44) | 45 | 44 | **97.78%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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