Worked around a compiler warning

modules/juce_core/text/juce_String.cpp

@@ -563,7 +563,7 @@ struct HashGenerator
     template <typename CharPointer>
     static Type calculate (CharPointer t) noexcept
     {
-        Type result = Type();
+        Type result = {};
 
         while (! t.isEmpty())
             result = ((Type) multiplier) * result + (Type) t.getAndAdvance();
@@ -574,9 +574,9 @@ struct HashGenerator
     enum { multiplier = sizeof (Type) > 4 ? 101 : 31 };
 };
 
-int String::hashCode() const noexcept       { return HashGenerator<int>    ::calculate (text); }
-int64 String::hashCode64() const noexcept   { return HashGenerator<int64>  ::calculate (text); }
-size_t String::hash() const noexcept        { return HashGenerator<size_t> ::calculate (text); }
+int String::hashCode() const noexcept       { return (int) HashGenerator<uint32>    ::calculate (text); }
+int64 String::hashCode64() const noexcept   { return (int64) HashGenerator<uint64>  ::calculate (text); }
+size_t String::hash() const noexcept        { return HashGenerator<size_t>          ::calculate (text); }
 
 //==============================================================================
 JUCE_API bool JUCE_CALLTYPE operator== (const String& s1, const String& s2) noexcept            { return s1.compare (s2) == 0; }