Fix tokenization of doubles

(cherry picked from commit 6759a28050885a25803e9bcb7fd53e38ea16ecf3)

core/variant_parser.cpp

@@ -324,6 +324,7 @@ Error VariantParser::get_token(Stream *p_stream, Token &r_token, int &line, Stri
 									is_float = true;
 								} else if (c == 'e') {
 									reading = READING_EXP;
+									is_float = true;
 								} else {
 									reading = READING_DONE;
 								}
@@ -335,7 +336,6 @@ Error VariantParser::get_token(Stream *p_stream, Token &r_token, int &line, Stri
 
 								} else if (c == 'e') {
 									reading = READING_EXP;
-
 								} else {
 									reading = READING_DONE;
 								}
@@ -347,8 +347,6 @@ Error VariantParser::get_token(Stream *p_stream, Token &r_token, int &line, Stri
 									exp_beg = true;
 
 								} else if ((c == '-' || c == '+') && !exp_sign && !exp_beg) {
-									if (c == '-')
-										is_float = true;
 									exp_sign = true;
 
 								} else {