drivers: pwm: stm32: clean indentation in instance init macros

Clean indentation in IRQ_CONNECT_AND_ENABLE_BY_NAME(), IRQ_CONFIG_FUNC()
and IRQ_CONNECT_AND_ENABLE_DEFAULT() macros of STM32 PWM driver.
Remove a useless trailing semi column character in the interrupt function
defined with IRQ_CONFIG_FUNC() macro.

Signed-off-by: Etienne Carriere <etienne.carriere@st.com>