Remove trailing newlines to fix pylint C0305 warnings

Author: Aniketsy

tensorflow_quantum/core/proto/pauli_sum.proto

@@ -32,4 +32,4 @@ message PauliTerm {
 message PauliQubitPair {
   string qubit_id = 1;
   string pauli_type = 2;
-}
+}

tensorflow_quantum/core/proto/projector_sum.proto

@@ -33,5 +33,4 @@ message ProjectorDictEntry {
   string qubit_id = 1;
   // False means |0> and true means |1>.
   bool basis_state = 2;
-}
-
+}