arch/armv7-m/assert: align printed message
arch/armv7-m/assert: align printed message

To make it easily see,

up_showtasks: *******************************************
up_showtasks: List of all tasks in the system:
up_showtasks: *******************************************
up_showtasks:                            NAME |   PID |  PRI |    USED / TOTAL STACK
up_showtasks: ---------------------------------------------------------------------
up_taskdump:                       Idle Task |     0 |    0 |       0 /       0
up_taskdump:                          hpwork |     1 |  224 |     332 /    2028
up_taskdump:                  binary_manager |     2 |  250 |     356 /    2020
up_taskdump:                  /dev/mtdblock2 |     4 |  220 |    4068 /    4068
up_taskdump:   !!! PID (4) STACK OVERFLOW !!!
up_taskdump:                    msg_receiver |     5 |  221 |     404 /    4068
up_taskdump:             multi_recv_nonblock |     6 |  221 |     452 /    4060
up_taskdump:               multi_recv_block1 |     7 |  221 |     468 /    4060
up_taskdump:               multi_recv_block2 |     8 |  221 |     468 /    4060
up_taskdump:                  /dev/mtdblock4 |     9 |  180 |    8164 /    8164
up_taskdump:   !!! PID (9) STACK OVERFLOW !!!
up_taskdump:                           uwork |    10 |  100 |     412 /    2028
up_taskdump:                            tash |    11 |  125 |     500 /    4076
up_taskdump:                      mkchildren |    12 |  100 |     500 /     996
up_taskdump:                          normal |    13 |  100 |     524 /    1004
up_taskdump:               assert_group_main |    14 |  100 |     564 /     988
up_taskdump:                       <pthread> |    15 |  100 |     548 /    2044
up_taskdump:                       <pthread> |    16 |  100 |     548 /    2044
up_taskdump:                       <pthread> |    17 |  100 |     572 /    2044

Signed-off-by: sunghan-chang <c954e25285721d8faa8b1a5c1ae2ef5a35338d32@samsung.com>

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