put TECS init bug to rest:

the uncostrained demanded pitch was never initialized which
could lead to large initial pitch integral values

src/lib/external_lgpl/tecs/tecs.cpp

@@ -512,6 +512,7 @@ void TECS::_initialise_states(float pitch, float throttle_cruise, float baro_alt
 		_hgt_dem_in_old = _hgt_dem_adj_last;
 		_TAS_dem_last = _TAS_dem;
 		_TAS_dem_adj = _TAS_dem;
+		_pitch_dem_unc = pitch;
 		_underspeed = false;
 		_badDescent = false;
 

src/lib/external_lgpl/tecs/tecs.h

@@ -72,6 +72,7 @@ public:
 		_detect_underspeed_enabled(true),
 		_badDescent(false),
 		_climbOutDem(false),
+		_pitch_dem_unc(0.0f),
 		_SPE_dem(0.0f),
 		_SKE_dem(0.0f),
 		_SPEdot_dem(0.0f),