Inject database connection to mrna_assay_tissue_data class

* wqflask/base/mrna_assay_tissue_data.py: Imports: Delete
database_connection, escape, and database_connector.
(MrnaAssayTissueData): Inject conn.  Re-format queries.  Rework 'if
... else' logic.  Re-work how results are assigned to
'self.data[symbol]' - remove dot-notation.
(MrnaAssayTissueData.get_symbol_values_pairs): Move box-comments to
doc-string.  Rework how results are assigned to 'symbol_values_dict' -
remove dot-notation.
* wqflask/tests/unit/base/test_mrna_assay_tissue_data.py
(test_mrna_assay_tissue_data_initialisation): New test.
* wqflask/wqflask/correlation/correlation_functions.py: Import
database_connection.
(get_trait_symbol_and_tissue_values): Inject conn object.

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