[RM-8433] [parameters] wrong enableIGM in load_linecatalog

Created on 2023-10-23 13:36:20 by Didier Vibert. % Done: 100

since #8048, inside load_linecatalog, the enableIGM boolean is wrongly computed

before #8048 the value was
<pre><code class="python">
enableIGM = self.parameters[object_type][method]["linemodel"]["igmfit"]
</code></pre>

whereas, now it is
<pre><code class="python">
enableIGM = self.parameters.get_solve_method_igm_fit(object_type, solve_method)
</code></pre>

and the code of @get_solve_method_igm_fit@ is
<pre><code class="python">
def get_solve_method_igm_fit(self, object_type: str, solve_method: str) -> bool:
igmfit = None
if solve_method == "LineModelSolve":
igmfit = self.get_lineModelSolve_igmfit(object_type)
elif solve_method == "TemplateFittingSolve":
igmfit = self.get_templateFittingSolve_igmfit(object_type)
elif solve_method == "TplcombinationSolve":
igmfit = self.get_templateCombinationSolve_igmfit(object_type)
return igmfit

</code></pre>

inside load_linecatalog, the @get_solve_method_igm_fit@ can be @"LineModelSolve"@ or @"LineMeasSolve"@

thus @"LineMeasSolve"@ is missing