Fix compile error if PIDTEMP is disabled

[anttix]

The build would fail with "error: 'unscalePID_i' was not declared in this scope"
if both PIDTEMP and PIDTEMPBED are disabled.

Requirements

Marlin should compile with PIDs disabled and EEPROM_SETTINGS enabled.

Description

Fixes a following compile error if both PIDTEMP and PIDTEMPBED are disabled but EEPROM_SETTINGS is enabled in config.

Compiling .pio/build/megaatmega2560/src/src/module/planner.cpp.o
Marlin/src/module/configuration_store.cpp: In static member function 'static bool MarlinSettings::save()':
Marlin/src/module/configuration_store.cpp:792:40: error: 'unscalePID_i' was not declared in this scope
           unscalePID_i(PID_PARAM(Ki, e)),
                                        ^
Marlin/src/module/configuration_store.cpp:793:40: error: 'unscalePID_d' was not declared in this scope
           unscalePID_d(PID_PARAM(Kd, e)),
                                        ^
In file included from Marlin/src/module/configuration_store.cpp:52:0:
Marlin/src/module/temperature.h:101:34: error: '_PID_Kf' was not declared in this scope
 #define PID_PARAM(F,H) _PID_##F(H)
                                  ^
Marlin/src/module/configuration_store.cpp:795:24: note: in expansion of macro 'PID_PARAM'
                        PID_PARAM(Kf, e)
                        ^
*** [.pio/build/megaatmega2560/src/src/module/configuration_store.cpp.o] Error 1

[anttix]

Close/Reopen magic to get TravisCI to rebuild. The failure was network related.