Remove whitespaces before double colon in errors and logs

src/script/interpreter.cpp

@@ -60,7 +60,7 @@ bool CastToBool(const valtype& vch)
 static inline void popstack(vector<valtype>& stack)
 {
     if (stack.empty())
-        throw runtime_error("popstack() : stack empty");
+        throw runtime_error("popstack(): stack empty");
     stack.pop_back();
 }
 

src/script/script.h

@@ -391,7 +391,7 @@ public:
     CScript& operator<<(opcodetype opcode)
     {
         if (opcode < 0 || opcode > 0xff)
-            throw std::runtime_error("CScript::operator<<() : invalid opcode");
+            throw std::runtime_error("CScript::operator<<(): invalid opcode");
         insert(end(), (unsigned char)opcode);
         return *this;
     }