fix: fiscal year start-end date in GST Balance

[Nihantra-Patel]

Version 15 and 14

• fix the fiscal year start date and end date in the report filter.

_{Huly®: IC-2718}

[vorasmit]

Thanks for pointing this out.

GST Balance is expected to be used month on month bases and I guess date similar to other GST Reports would give better ux.

india-compliance/india_compliance/gst_india/report/gstr_1/gstr_1.js

Line 59 in 1fbd04b

default: india_compliance.last_month_start(),

Hence updating the PR.