tmtests/tm26: Fix context switch to FP task

It is wrong to restore the floating point context here.  The
_Context_Switch() ends up in _Thread_Handler() which will call
_Thread_Restore_fp().  In _Thread_Do_dispatch() the FP restore is after
the context switch.

testsuites/tmtests/tm26/task1.c

@@ -439,9 +439,6 @@ rtems_task Low_task(
   thread_disable_dispatch();
 
   benchmark_timer_initialize();
-#if (CPU_HARDWARE_FP == 1) || (CPU_SOFTWARE_FP == 1)
-    _Context_Restore_fp( &_Thread_Get_executing()->fp_context );
-#endif
     _Context_Switch(
       &executing->Registers,
       &_Thread_Get_executing()->Registers