common_test: fix interactive prompt #18067

Job	Run time
Event File	3s
Build Erlang/OTP (64-bit)	17m 49s
Build Erlang/OTP (iOS)	5m 14s
Build Erlang/OTP (Types and Flavors)	7m 44s
Build Erlang/OTP (32-bit)	10m 47s
Build Erlang/OTP (macOS)	4m 38s
Build Erlang/OTP (Windows)	9m 59s
Build Erlang/OTP (cross-compile)	15m 15s
Build Erlang/OTP (clang)	6m 29s
Build and check documentation	6m 17s
Run static analysis	7m 38s
Test Erlang/OTP (common_test)	1h 16m 19s
Release Erlang/OTP	0s
Test Erlang/OTP (system)	8m 4s
	2h 56m 16s

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