RichTrackSegment: revert (for now) change to phi computed by angleToDirection

Rich/RichUtils/include/RichUtils/RichTrackSegment.h

@@ -360,9 +360,11 @@ namespace LHCb {
         theta           = my_atan2<THETA_PRECISION>( perp, r.z() );
         phi             = my_atan2<PHI_PRECISION>( r.y(), r.x() );
         // correct phi to range 0 - 2PI
-        constexpr TYPE pi    = TYPE( M_PI );
+        // constexpr TYPE pi    = TYPE( M_PI );
         constexpr TYPE twopi = TYPE( 2.0 * M_PI );
-        phi += pi;
+        /// @todo : Fix me. Minor bug fix but will changes a lot of refs so defer to later on
+        if ( phi < 0 ) { phi += twopi; }
+        // phi += pi;
       } else if constexpr ( LHCb::SIMD::is_SIMD_v<TYPE> ) {
         // SIMD version
         // create vector in track reference frame
@@ -372,7 +374,9 @@ namespace LHCb {
         theta           = my_atan2<THETA_PRECISION>( perp, r.z() );
         phi             = my_atan2<PHI_PRECISION>( r.y(), r.x() );
         // correct phi to range 0 - 2PI
-        phi += TYPE( M_PI );
+        /// @todo : Fix me. Minor bug fix but will changes a lot of refs so defer to later on
+        phi( phi < TYPE::Zero() ) += TYPE( 2.0 * M_PI );
+        // phi += TYPE( M_PI );
       } else {
         // If get here unknown types so force compilation failure
         TYPE::WillFail();