scripted-diff: Use randbits/bool instead of randrange where possible

-BEGIN VERIFY SCRIPT-
sed -i 's/insecure_randbits(1)/insecure_randbool()/g' src/test/*_tests.cpp
sed -i 's/insecure_randrange(2)/insecure_randbool()/g' src/test/*_tests.cpp
sed -i 's/insecure_randrange(4)/insecure_randbits(2)/g' src/test/*_tests.cpp
sed -i 's/insecure_randrange(32)/insecure_randbits(5)/g' src/test/*_tests.cpp
sed -i 's/insecure_randrange(256)/insecure_randbits(8)/g' src/test/*_tests.cpp
-END VERIFY SCRIPT-

src/test/pmt_tests.cpp

@@ -22,7 +22,7 @@ public:
     // flip one bit in one of the hashes - this should break the authentication
     void Damage() {
         unsigned int n = insecure_randrange(vHash.size());
-        int bit = insecure_randrange(256);
+        int bit = insecure_randbits(8);
         *(vHash[n].begin() + (bit>>3)) ^= 1<<(bit&7);
     }
 };