util: Adjust Fraction class addition overload overflow tests #3044

Job	Run time
macOS 12 native [GOAL install] [GUI] [no depends]	12m 0s
Lint	44s
ARM [GOAL install] [buster]	8m 39s
Win32	10m 50s
Win64	14m 49s
i386 Linux [GOAL install] [focal]	8m 59s
x86_64 Linux [GOAL install] [GUI] [focal] [no depends]	16m 40s
x86_64 Linux [GOAL install] [GUI] [bionic] [no depends]	15m 53s
macOS 10.14 [GOAL deploy] [GUI] [no tests] [focal]	10m 1s
	1h 38m 35s

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