When the method is updated inside libcurl we must still not change the
method as set by the user as then repeated transfers with that same
handle might not execute the same operation anymore!
This fixes the libcurl part of #5462
Test 1633 added to verify.
Closes#5499
Detected by Coverity. CID 1462319.
"The same code is executed when the condition result is true or false,
because the code in the if-then branch and after the if statement is
identical."
Closes#5275
