Update KeyMatrix.c: remove trailing spaces

Author: dhalbert

shared-module/keypad/KeyMatrix.c

@@ -134,10 +134,10 @@ static void keymatrix_scan_now(void *self_in, mp_obj_t timestamp) {
         // to switch values. Just switching to an input with a (relatively weak) pullup/pulldown
         // causes a slight delay in the output changing, which can cause false readings.
         common_hal_digitalio_digitalinout_set_value(row_dio, self->columns_to_anodes);
-        
+
         // Wait a moment to let the columns settle.
         mp_hal_delay_us(1);
-        
+
         // Switch the row back to an input, pulled appropriately
         common_hal_digitalio_digitalinout_switch_to_input(
             row_dio, self->columns_to_anodes ? PULL_UP : PULL_DOWN);