No. Nothing in the Withdrawal Bill gives Ministers the right to make major constitutional changes. Abolishing General Elections would require Parliament to repeal at least the Fixed Term Parliaments Act, The Representation of the People Act, and the Human Rights Act.
Abolishing general elections would also require a fundamental change to the UK constitution and by convention, such a change would need to be approved by referendum. The constitution with regard to referendums is developing, however, the tradition is that "Major" constitutional changes should be referred. There have been referendums on the voting method, Scottish Independence and EU membership. (Minor changes to the constitution, such as the timing of elections, are not referred.) If changes to the voting method are "major", then abolition of voting must also be considered major.
But let's be a little reasonable here. The UK is a mature democracy, and there is nobody in Parliament who has even suggested anything like the abolition of voting. It's not going to happen. It's not matter for discussion.
The "anti democratic" clause of the Withdrawal Bill states
A Minister of the Crown may by regulations make such provision as the
Minister considers appropriate to prevent, remedy or mitigate—
(a) any failure of retained EU law to operate effectively, or
(b) any other deficiency in retained EU law, arising from the withdrawal of the United Kingdom from the EU.
This allows a minister to adjust laws to deal with issues where UK law makes reference to EU institutions to which the UK will no longer belong. It is considered undemocratic as it allows for ministers to change laws without direct parliamentary approval. It does not allow the government to abolish general elections.