[pgAdmin4][Patch]: RM #1994 Insert / update are truncating if column is character

Please find the attached patch to fix the RM #1994 Insert / update are truncating if column is character. 

Issue: Create any column with datatype as character and provide some length (10), now view the data in pgAdmin4 and try to insert/update that column it gets truncated to one character. In insert/update query we have type casted the value with data type like "col_val::character" but not provided the length while type casting it, so it is truncated to one character. 

Solution: We can solve this in many ways(server side, client side), but for server side it requires too much of code changes. So instead of doing that I have fixed this at client side in "sqleditor.js" file from where we send the modified/inserted data to the server. Following is the fix:

After this fix if user inserts more character than the specified length it will be truncated to that length and saved it into the database.    

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