[MU4 Task] [TECH_DEBTS] Fraction from/to ticks does not work properly

[Eism]

    Fraction fr1(1, 256);
    int ticks = fr1.ticks();

    Fraction fr2 = Fraction::fromTicks(ticks);

    EXPECT_EQ(fr2.numerator(), 1);
    EXPECT_EQ(fr2.denominator(), 256);  // fail: denominator == 240

[jeetee]

This is somewhat expected as a 1/256th is the first fraction that falls below our basic midi resolution of 480 ticks / quarter note.
See jeetee:MuseScore:fraction_ticks_convertions for a reference initial test showcasing this.

1/256th => 7.5ticks but is ceiled to 8 in the ticks function, which makes that 3rd EQ fail as division/64 is floored instead.